1 PARTITION
  Syntax: PARTITION id [&idb] xlo xhi [ylo yhi]
   where: id  is the histogram identifier
          idb is the (optional) secondary identifier
          xlo is the new lower limit for the x axis
          xhi is the new upper limit for the x axis
          ylo is the new lower limit for the y axis (only for 2-D plots)
          yhi is the new upper limit for the y axis (only for 2-D plots)

  Cuts out part of a plot between  the limits `xlo' and `xhi' (and between
  `ylo' and  `yhi' if it is a  2-D  plot). The  new plot will be
  stored  with the  same  identifiers  as the  old one.  To make  one with
  different  identifiers use the  `CUT' and `PROJECT'  commands, or `COPY'
  then `PARTITION'.

  The commmand is also useful to set the limits and fill the arrays
  that contain the mean etc. for histograms and scatter plots that
  have been booked and filled using the `BOOK' and `FILL' commands, as
  Mn_Fit does not know when you have finished filling a plot.

