2 V2_00_00   06/11/89  08.00.00
  06-Nov-1989

  If you define commands inside a macro then use the form @@1 in DEFINE
  to be prompted for the parameter value only when you execute the command.

  There are now 4 lines available for the header. This necessitated changing
  the default picture size to 19.5 x 20.5 cm.

  You can now give the font to use for the scale. The scale colour should
  be set with the SET COLOUR SCALE command and not in SET SCALE.

  Where you can give = to keep a parameter value (COMMENT, KEY, SET LABEL,
  SCALE, TICK etc.) you can now use the form =+0.2 to increase its value  etc.
  See HELP NUMBERS for more details.

  HELP in SET X LABEL, SCAL etc. now works properly.

  The mean and sigma are now calculated properly for a series of points and
  scatter plots.

  Asymmetric x errors are handled properly in fitting. Log scales should
  be OK even if overlayed plots go negative.

  Index no longer bombs for long file names. FUN OVER also no longer bombs
  after a display if the plot being fit is a series of points (DAT_FETCH'ed)

  Improved output for the LDIR command.

  There is no longer a default file extension for histogram files. This is
  because you could not use a logical name for the complete file.

  It is now possible to use registers, parameters etc as histogram
  identifiers. However note that if you do it is necessary to put a space
  before the & delimiting the secondary id. It is also possible to use
  registers, parameters etc. for positions in the DRAW command.

  Bug in filling histograms fixed - the AREA was just the number of entries
  and the weight was not taken into account.

  Rebin checks the bin numbers properly.

  Bug in CUT USE with multiple parenthese at the end of the line fixed.

  Segment errors fixed in HARDCOPY - thank to Jon Lewis.
  HARDCOPY sped up by a large factor for VAXGKS and DGKS3D - again thanks
  to Jon.

  Grinnell picture should be back to the proper spot.

  Return to 1 column format to list current values of variables if there
  are less than 6 variables. Otherwise use 2 column format. Does anyone
  have any better ideas?

  Line thickness in text should work properly - a la IGTEXT!

  Compact AVEHST files can now be read i.e. blank in first column is not
  required.

  New commands:
  WAIT    Stop Mn_Fit for a time - useful in macros if you loop

  04-Oct-1989
  Date and time plots were made now available in HEADER and DUMP.
  They are shown in the full header (default).
  Scale and normalization in histogram operations (ADD etc.) can now
  be a register, parameter etc.
  Colour in text works properly.
  Variable names are now X and Y for AVEHST scatter plots. Title is not
  stored with AVEHST scatter plots, so gets set to "No Name" in Mn_Fit.
  Bug in fitting using histograms fixed.
  After CTRL-C while inside MINUIT you can now restart MINUIT.

  New commands:
  QUIT  Exits the program (replacement/alias for EXIT).
  CDIR  Changes the current HBOOK directory (alias for SET DIR)

  04-Sep-1989
      New option in SET HEADER/IDSHOW to display area, mean and sigma
      of plots. Bug fixed in SET LABEL if the label started with the
      sequence M(. New information added to the header to give the mean
      and ssigma of each plot.

      Line thickness for text should now work. Variable width AVEHST
      histograms should now be read in OK.

      More minor and tedious modifcations so that the code can run on the
      Apollo.

      Decwindows added as a device in VAXGKS (thanks to Jon Lewis)

      L3 BGO luminosity monitor and BGO displays built in. Error and
      message routine built in, so that Mn_Fit menu package can run on
      a different Vaxstation from the display.

      New commands:
      DISPLAY/xxxx  to get an L3 online display
      SET PAR xxxx  to change parameters for L3 online displays
      SET KEY xxxx  to set up the key for L3 online displays

      Modified commands:
      SET HEADER   Possible options are now FULL, BRIEF, ON and OFF
      SET IDSHOW   Possible options are now FULL, BRIEF, ON and OFF

  20-May-1989
      Note that the fitting parameters when fitting more than one plot
      simultaneously have changed to improve convergence and avoid some
      overflows in MIGRAD. (see HELP FIT for more details).

      The order of errors in DISPLAY, FIT_INFO, HIST DUMP and DAT_STORE
      has been changed to have negative followed by positive.

      It is now possible to write the contents of registers, parameters etc.
      in COMMENTS, axis labels etc. (see HELP TEXT and HELP NUMBERS) for
      more details.

      It is now possible to store multiple plots in the same file with the
      DAT_STORE command.

      DISPLAY and FIT_INFO now give the total and fitted areas for both
      the plot and the function.

      MINUIT code is now all in FORTRAN and BYTE statements have been
      removed, in preparation for running on Apollos. Should be transparent
      to the user. MIGRAD is a bit better protected against overflows.

      A bug in REBIN which meant that if you did not start rebinning at bin
      1, things were not correct has been fixed.
      DISPLAY modes 2 and 3 now work properly.
      If a hardcopy file cannot be opened an error will be given rather than
      Mn_Fit crashing (in the GKS version).
      DEFINE now checks if a defined command already exists.
      SET ORTHOGONAL now works.
      FUNCTION OVERLAY now works properly outside of DISPLAY as well.
      DO loops which should not be executed now work properly. The next
      command after the end of the DO loop was being ignored.
      Y, DY, DNY and DPY are returned properly for 1-dimensional histograms.
      It was possible to get an error complaining about the bin number
      before which was not correct.

      New commands:
      HB_OPEN        to open an HBOOK4 histogram file
      LDIRECTORY     to list the contents of the current HBOOK directory
      SET DIRECTORY  to set the current HBOOK directory
      SHOW DIRECTORY to list the contents of the current HBOOK directory

      Modified commands:
      SET ORDER      has new variable names DNX, DNY, DPX and DPY to replace
                     DXN, DYN, DXP and DYP.

  23-Mar-1989
      More registers have been added so that the user has access to useful
      information.
      The chi**2/likelihood and confidence level are now put into registers
      111 and 112. Registers 121 onwards are used to store information on
      the current default plot.
      It is now possible to change parameter limits, plot limits, plot
      errors (including asymmetric errors), the contents or position of
      any point etc. See HELP NUMBERS or HELP DEPOSIT/EXAMINE for details.

      Fixed bug in labels for top and right-hand axes (weren't drawn in the
      right place).
      Fixed bug in DIVIDE for plots with asymmetric errors. The positive
      error was being computed wrongly.
      The x error was being computed wrongly if you used the HIST ERROR
      command for a series of points.
      Protection added in DEPOSIT and CALC against dividing by zero and
      taking the square root of a negative number.

      Modified commands:
      SET PLOT id DEFAULT  This command now puts informnation on the plot
                           given into register 121 onwards (see HELP NUMBERS
                           or HELP SET DEFAULT).

  12-Jan-1989
      Please read the warning in HELP FIT or the write-up section on
      fitting on recommended fitting procedures.

      Bug fixed using DEFINED commands without parameters where the
      first command was ignored. Date and time are now printed in the
      FIT_INFO command if DUMP is set to LPT. Version number is now
      gotten directly from CMZ and the news is also kept in the same
      routine, eliminating files MN_VRS.FIL and MN_NWS.FIL.
      Bug fixed in DRAW command when using PLOT co-ordinates.

  05-Jan-1989
      The EXIT command must be at least EXI, otherwise you will be
      prompted to ask if you really want to EXIT.
      There are now extra registers 100-110 which are used by Mn_Fit
      to store useful numbers. Register 100 contains the chi**2 or
      likelihood of the fit and register 101 contains the result of
      a SUM or INTEGRATE command.

      The PLTSUB version has a new screen device FALCO (also works
      for a Pericom Graphic terminal) which enables me to check out the
      PLTSUB version at CERN.

      New commands:
      SHOW FILES  to list the current hardcopy and dump files and the
                  currently open units

  21-Dec-1988
      The syntax of the CUT command was changed to make it easier to use
      and to improve it.

      The DO command is now called EXECUTE to bring it
      in line with PAW and KUIP and to release DO for DO loops inside
      Macros which have been implemented. Parameters including imbedded
      blanks shoudl be enclosed in single rather than double quotes.
      The command LINE has been changed
      and improved. The syntax is now DRAW LINE and arrows, boxes triangles
      etc. are also available.

      A login macro can now be executed. First the file MN_LOGON.MNF is
      searched for in the local area and then the logical name MN$LOGON.
      If either of them is found they are executed.

      Registers, parameters etc can now be used in the PART, REBIN, COMMENT,
      KEY, and the SET LABEL, SCALE, LIMITS, FRAME, and TICKS commands etc.
      See HELP NUMBERS for details of the syntax.
      The EXAMINE command can be used to look at the contents of registers,
      parameter values, bin contents etc.

      Colours and fonts are now integrated in a better and more uniform
      fashion. It is now possible to specify the hardcopy filename (GKS
      version only) and to specify the dump file name.

      HELP has been updated. All commands should be in and their description
      correct. Please let me know of any errors or if anything is unclear.

      New commands:
      EXECUTE       Replaces the Do command
      DO, ENDDO     DO loops - only available inside Macros (see HELP DO)
      DRAW          Draw various shapes and lines on a picture
      EXAMINE       Examine the contents of registers, parameters, bins etc.
      SET COLOUR    Set the colour of parts of a picture
      SET THICKNESS Set the line thickness of parts of a picture
      SET HARDCOPY  Set the filename for hardcopies
      SET DUMP FILE Set the filename for dumping
      SET WMARGIN   Change the margin inside a window
      SET WSIZE     Change the size of plot inside a window

      Modified commands:
      CUT   no longer has a plot number and syntax has changed
      LINE  is now DRAW LINE with changed syntax

  02-Jul-1988
      The bin contents, errors, and data points are now accessible
      in the DEPOSIT, CALCULATE and FILL commands. See HELP DEPOSIT
      for details of how to access them.

      Modified commands:
      DEPOSIT and FILL Parameters are now referenced as Pn(m) where n
      is the function number and m is the parameter number. (This is
      the opposite of the orginal and the MULFIT order, but the author
      thinks it is more logical and easier to remember!!).

  23-Jun-1988
      Help on Fit improved, with description on how to simultaneously fit
      plots with the same or different background functions.
      Up to 30 dimension Ntuples can be read in.
      Switching hardcopy devices now works properly. Limits on data
      read in with the DAT_FET command are calculated properly.
      Bug in getting variable names and in INDEX when using Ntuples fixed.
      Comis functions can now be stored and fetched.

      Modified commands:
      ADD, SUBTRACT, MULTIPLY, DIVIDE, SCALE, NORMALIZE, EFFICIENCY
      You can now give a range of plots to add etc.
      KEY  Now gives a key for hatching and patterns also
      HARDCOPY  LN03 added as a hardcopy device - Tektronix mode

  13-Jun-1988
      BOOK and FILL commands added (see HELP HISTOGRAM BOOK and
      HISTOGRAM FILL). Use in conjunction with the DEPOSIT command to
      fill plots with fit results for example.
      Histograms with more than 1000 bins can now be plotted.
      Bug fixes in DISPLAY for 2-D fitting, plot operations for plots with
      different limits, SQUEEZE command, HELP when changing scale, limits etc.

      New commands:
      HIST BOOK   Books a new plot inside Mn_Fit (see HELP HISTOGRAM BOOK)
      HIST FILL   Fills a new plot inside Mn_Fit (see HELP HISTOGRAM FILL)
      BOOK        Alias for HIST BOOK
      FILL        Alias for HIST FILL

  02-Jun-1988
      CUT was not working properly from 25th May - 2nd June.

      DISPLAY MODE 2 and 3 now work properly. Functions can now be
      overlayed within DISPLAY MODE 3 properly also.
      Bin width for variable bin width AVEHST plots now correct.

  27-May-1988
      HBOOK variable bin width plots are now read in properly.
      Bug fixes for fixed parameters in MINUIT being permanently fixed
      after you exit MINUIT, plots with no errors being displayed with
      errors, operations on data points with errors, HARDCOPY when
      a comment ws on same line and filled symbols in GKS version.
      Scale improved for lego plots.

      Modified commands:
      BACK_SUB   Must give SET BACKGROUND command beforehand to make syntax
                 more predictable
      DISPLAY    Must give SET BACKGROUND command beforehand to make syntax
                 more predictable if using modes -2, 2, -3 or 3.

  24-May-1988
      When doing ADD, SUBTRACT, MULTIPLY, DIVIDE, SCALE or NORMALIZE the
      default is now to give an error of 1 to zero points. This also applies
      when doing a chi**2 fit to plots with zero points. To use an error
      of zero use the SET ERR_ZERO command.
      Zero points with zero errors are now shown. Use the SET SHOW_ZERO
      command to suppress the points again.
      Bug in calculation of errors for efficiencies with small numbers of
      events fixed (now the MULFIT calculation is used).

      New prompts MN_CMD> when in plotting mode, MINUIT> when inside MINUIT.
      DEFINE and UNDEFINE commands to replace OPER.
      Ntuples written in ASCII format can be read in using the DAT_FETCH
      command (see HELP DAT_FETCH for more details).
      Lego plot now has scale drawn in for x and y axes

      The default overall size of the picture has been changed to 19.5x20.0cm
      (used to be 20x20cm) so that it is smaller than the default Postscript
      page size for VAXGKS. The size of the plots has not changed - the right
      margin will be 0.5cm smaller).

      COMAND routine for MINUIT rewritten (should be transparent except for
      error messages).
      Bugs fixed in MN_STORE, CUT and PROJECT, COMMENT and KEY.
      Hatching and patterns should work properly with limits set. Pattern
      drawing improved.
      In the GKS version the symbol filling is now done with the fill area
      routine, instead of drawing lots of lines.

      New commands:
      DEFINE        Defines a new command as a series of existing ones.
      UNDEFINE      Gets rid of an internally defined command.
      SHOW COMMAND  Lists the internally defined commands.
      FCN_PLOT      Plots the chi**2 or likelihood as a function of a
                    variable.
      PROB_PLOT     Plots the probablility of a variable having that value
                    as a function of the variable.
      SET ERR_ZERO  Sets the error on zero points to 1 or not.
      SET SHOW_ZERO Shows zero points which have zero errors or not.

      Modified commands:
      HIST ERROR    New mode added to give error of 1 to zero points.
      COMMENT       Syntax made more predictable when reading from a file.
      KEY           Syntax made more predictable when reading from a file.
      CUT           Syntax made more predictable when reading from a file.
      LINE          Syntax made more predictable when reading from a file.

      Deleted MINUIT commands:
      OPER          Replaced by DEFINE.
      END_OPER      Replaced by ENDDEF.
      END           Eliminated as a MINUIT command to avoid confusion.

  15-Apr-1988
      GKS version only:
         New commands:
         SET HATCH    to define hatching symbol
         SET PATTERN  to define pattern

         Modified command:
         OVERLAY      You can now give a hatch and or pattern after the symbol
                      number. See HELP OVERLAY for more details

  07-Apr-1988
      COMIS interface improved - functions are now referenced by their address
      rather than their name, so execution should be faster. Function names
      can be anything you like.
      Bug in new Landau function fixed.
      Example files added - see HELP EXAMPLES
      The commands DEPOSIT and CALCULATE have been added, which use the
      calculator from MULFIT - but they have not been fully tested yet, so
      use at your own risk!!

      New commands:
      COMIS             to invoke COMIS directly.
      FUNCTION COMPILE  to compile a COMIS function you have already added
      FUNCTION EDIT     to edit and compile a COMIS function you have already
                        added.
      DEPOSIT           to change the values of function parameters
      CALCULATE         to CALCULATE expressions

  28-Mar-1988
      CERN COMIS package added.
      Fixed bug in DISPLAY command. If you were fitting with histograms and
      had no exclusions, DISPLAY used to blow up.
      Fixed bug in MN_STORE - plot titles were not always stored properly

      New commands:
      FUN ADD COMIS uses the CERN Compiler and Interpretation System (COMIS)
                    to interactively define functions without the need to
                    relink your program (see HELP FUNCTION LIST COMIS for
                    more details on how to use it).
      SET RECL      to set the record length for HBOOK version 4 files.

  24-Mar-1988
      The default version of HBOOK is now HBOOK4. To fetch HBOOK3 plots use
      the HB3_FETCH command. Use FETCH or HB_FETCH to fetch HBOOK4 plots.
      Histograms written out using Chris Rippich's HYBRID can now be fetched
      using the HY_FETCH command
      Mn_Fit can also run with GKS instead of PLTSUB, giving shading options
      (see HELP SET SYMBOL) and more GKS features in the future.
      SET FONT command for changing the text font
      The STORE command will now use the HROUT routine to write out the
      plots.

      New commands:
      HB3_FETCH    to fetch HBOOK version 3 plots
      HB_FETCH     alias for FETCH to fetch HBOOK version 4 plots
      HY_FETCH     to fetch Chris Rippich's HYBRID plots
      SET FONT     to set the text font

      Modified commands:
      FETCH        Now fetches HBOOK version 4 plots
      STORE        Now stores HBOOK version 4 plots

  05-Jan-1988
      New screen devices inside the program (Versaterm, VAXstation and
      VT240).  Use the MN_FIT.COM file to run Mn_Fit for all devices.

      New commands:
      SUM        to sum the contents of a plot over a given range
      INTEGRATE  to integrate one or more functions over a given range

  22-Dec-1987
      Major changes in SET for plots you have already made (see HELP SET)
      PLOT 0 and PLOT id1:id2 now work

      New commands:
      SET ORDER        to specify the order of the arguments in DAT_FETCH
                       and READ DATA files
      SET PLOT ...     to change something for a particular plot
                       (see HELP SET and  HELP SET PLOT)
      SET DISPLAY ...  to change the sizes etc. used in DISPLAY
      SET PSIZE        to set the overall size of the picture
                       (used to be SET SIZE)
      SET FRAME        to set where you want a frame round the plot
      SET AXIS         to label an axis and specify where you want it
      SET LABEL        to label an axis and specify where you want it
      SET X|Y ZERO     draw a line at x or y=0 (alias for SET X|Y NULL)
      SET TICKS        to specify numbers of ticks and which axes you want
                       them on
      SET SCALE        to specify position and size of scale and which axes
                       you want it on
      SET NO_WINDOW    turn off windowing (alias for NO_WINDOW)
      SET NEXT_WINDOW  to set the window for the next plot
                       (instead of SET WINDOW)

      Modified commands:
      PLOT          now has qualifiers /CLEAR and /NOCLEAR.
                    See HELP HISTOGRAM PLOT
      OVERLAY       now has qualifiers /SAME and /DIFFERENT.
                    See HELP HISTOGRAM OVER
      SET SIZE      is now SET PSIZE
      SET HSIZE     and SET SIZE do the same thing
      SET WINDOW    is now an alias for WINDOW
      SET DEFAULT   when preceded by SET PLOT is the same as SET HIST
      PARTITION     now works for 2-dimensional histograms
      REBIN         now works for 2-dimensional histograms
      CUT           calls PROJECT automatically after you have set up the cuts
      SPAWN         is now the same as SHELL
      MN_STORE      works with a range of histograms
      MN_FETCH      works with a range of histograms
      DAT_FETCH     has new data cards and you can have more than one dataset
                    in a file.
      PRINT         can now print all or a range of histograms

  09-Nov-1987
      A range of histograms can now be specified for the INDEX, DELETE,
      PLOT and all the FETCH and STORE commands. The range is delimited
      by a ":" (see HELP IDENTIFIERS for more details).

      All functions plotted are now available in plots for further
      manipulation if required.

      To specify secondary ID's on the same line as function or variable
      numbers (e.g. in the FUN PLOT and PROJECT commands) precede them by
      an "&".

      Versaterm and Tektronix handling further improved.

      Syntax for text strings changed slightly (see HELP CHARACTERS)

      The argument list for XMNUSR (user function) has expanded. See
      HELP FUNCTION USER for details.

      Functions which are histograms now get plotted as histograms

      New commands:
      FUNCTION OVERLAY overlays a function on a plot
      SET BACKGROUND   defines which functions are background
      SET HISTOGRAM    defines a default histogram for the CALCULATE command etc
      SET NORMALIZE    turns on and off an overall normalization factor for
                       the functions you are fitting
      SET ORTHOGONAL   defines the orthogonality limits for Chebyshevs etc
      SET SIGNAL       defines which functions are signal

      Modifed commands:
      BACK_SUB see HELP MINUIT BACK_SUB
      DISPLAY  (if the display mode is not 1) see HELP MINUIT DISPLAY
      FUNCTION PLOT and HIST now work in the MN_CMD stage
      LINE     see HELP LINE

  26-Oct-1987
      FUN FETCH and FUN STORE now work properly
      10 bit Tektronix resolution now supported (see HELP SCREEN_DEVICE)
      New commands:
      SET ECHO       to turn on and off echoing commands when reading from
                     a file
      SET AUTOSWITCH to switch automatically from Tektronix plotting mode
                     to alphanumeric mode. If AUTOSWITCH is off you must
                     give the next command or hit <CR> to get back to
                     alphanumeric mode after making a plot.
      Changed commands:
      COMMENT, LINE, CUT, EXCLUDE  now work like SET:
      If you just give the command then you will stay in COMMENT etc. until
      you hit a <CR> or give the command END. If you give a command like
      COMMENT CHANGE then you will exit COMMENT after changing one comment.

  01-Oct-1987
      CTRL-C handler implemented, courtesy of Rohit Namjoshi and HTV
      Be aware CTRL_C during FORTRAN I/O can give problems. Protection
      has been built in in heavily used areas, but not everywhere.
      Please report any problems. See HELP CONDITION_HANDLER for more details.

      New command PRINT to print a histogram on the terminal or a file

      PROJECT works on real scatter plots and n-dimensional histograms and
              can be used to convert a scatter plot to an n-dimensional
              histogram
      HARDCOPY devices are now TEKTRONIX (PLOT.T12), TALARIS (PLOT.QMS),
               POSTSCRIPT (PLOT.PS), IMAGEN and VERSATEC.

      Command ERRORS has been renamed to HIST ERROR to avoid conflict with
      the MINUIT command ERROR_DEF.

      HELP should now be complete. Please notify me of any omissions or
      errors, or anything that is unclear.

  01-Sep-1987
      Postscript implemented - use HARD POSTSCRIPT
      HARD LN03 will also produce postscript, but in the near future
      this will be changed to be Tektronix as it used to be.

  03-Aug-1987
      New commands:
      LEGO and HIST LEGO to make lego plots
      ARGUS background function for B decays added (FUN ADD ARGUS)
      Files can now be aborted if an error is found

      Modified commands:
      SET UNIT is now SET DUMP and you can specify TTY or LPT or CLOSE

  27-Jul-1987
      The syntax for specifying secondary identifiers has changed.
      If you want to give the histograms secondary ID precede it
      by a &. e.g. PLOT 300&1 or COPY 150&0 320
      If you omit the secondary ID the default will be taken.
      You can now pass parameters when you execute a file
      (see HELP EXECUTE for more details)

      New commands:
      ERRORS  to change the errors for a histogram
      HMAKE   to make an HBOOK histogram from a Mn_Fit histogram
      HRENAME to rename just an HBOOK histogram
      HDELETE to delete just an HBOOK histogram
      REDRAW  is also a valid command within SET
      SET UNIT to change the output unit for DUMP commands
               changed to SET DUMP - 3rd August 1987

      Mofified commands:
      SET NULL is now SET X|Y NULL so that you can draw a line
               at x=0 or y=0
      EXEC filename parameter_list to pass parameters to a file
      SET If you specify the command on the same line as SET you
          exit SET automatically
      AVE_FETCH now works for 2-dimensional AVEHST histograms

  20-Jun-1987
      Major modification and complete reorganization of the internal data
      structure:
      Secondary identifiers introduced
      Scatter plots (HBOOK, AVEHST) can now be fetched and plot
      Multi-dimensional histograms intoduced (see HELP NDIMENSIONS)
      Histograms can be used as functions when fitting (FUN ADD HIST)

      Many new commands:
      REBIN
      EXEC (alias for READ COMMAND) to read a file with commands
      DAT_FETCH read an ADCII file with data points (alias for READ DATA)
      DAT_STORE store a plot in an ASCII file
      MN_FETCH to fetch a multi-dimensional histogram
      MN_STORE to store a multi-dimensional histogram
      SCT_FETCH to fetch an AVEHST true scatter plot
      PLOT n part to plot and extract part of an HBOOK histogram such as
                  an associated function or a BAND (see HELP PLOT)
      FUN ADD HIST to use a histogram as the function to fit to
      FUN STORE to store the parameters of a function
      FUN FETCH to fetch the parameters of a function previously stored
      CUT to apply cuts to a multi-dimensional histogram
      NO_CUT to turn off the cuts on a multi-dimensional histogram
      PROJECTION to make a projection of a multi-dimensional histogram
      SMOOTH to smooth a histogram
      SPLINE to spline fit a histogram
      SPAWN to execute a single DCL command
      SHELL to spawn a subprocess
      EDIT to edit a file from with Mn_Fit
      ATTACH to attach to another process
      SQUEEZE to get back unused space for Mn_Fit
      SET DEFAULT to set all plotting parameters back to their default values
      SET IDB to change the default secondary identifier
      SET EDIT to change the default editor (TPU) to your favourite
      SET NULL instead of SET ZERO because of ambiguity with SET Z
      SET Z to set the limits on the number of entries for scatter plots
      SHOW COMMENT to show the currently booked comments
      SHOW KEY     to show the currently booked key descriptions
      SHOW CUT     to show the cuts on a multi-dimensional histogram
      COMMENT DELETE to delete a comment
      KEY DELETE to delete a key description
      COMMENT MOVE no longer exists (use COMMENT CHANGE)
      KEY MOVE no longer exists (use KEY CHANGE)

      Commands with modified syntax (see HELP for more details):
      FETCH
      AVE_FETCH
      PLOT
      OVERLAY
      FUN PLOT
      FUN HIST
      PARTITION
      ADD, SUBTRACT, MULTIPLY, DIVIDE, EFFICIENCY, SCALE, NORMALIZE
      COPY
      RENAME
      DELETE
      SET SYMBOL - new symbols introduced plus symbols for scatter plots

  29-May-1987
      Can now multiply the scale by a scale factor (see SET X|Y SCALE)

  22-May-1987
      Log scaling now available SET X|Y MODE 2 to get log scale
      OVERLAY command is equivalent to HIST OVERLAY
      DUMP of histogram contents is now HIST DUMP to avoid conflict
      with DUMP command inside MINUIT
      COMMENTS, KEYS and LINE positions can be defined in cm or in terms
      of co-ordinates of last plot (Mode flag)

  13-May-1987
      SET_CALLS     is now CALLS         (MINUIT command)
      SET_PRECISION is now PRECISION     (MINUIT command)
      PLOT          is now DRAW          (MINUIT command)
      DRAW          is now ITERATIONS    (MINUIT command)
      NO_DRAW       is now NO_ITERATIONS (MINUIT command)
      SET_PLOT      is now SET everywhere
      PLOT  can now be used instead of HIST PLOT everywhere
      Virtually all commands are valid in MN_CMD and MINUIT
