1 Identifiers

  Identifiers are numbers associated  with a plot. In Mn_Fit there are two
  identifiers associated  with each plot. For  some commands,
  e.g. `INDEX, FETCH, PLOT', you can specify a range of plots which the
  command applies to. The range is delimited by a  `:'. You can specify a
  range of primary or secondary  identifiers or both.  In general  if you
  give as primary identifier 0,  this means  all histograms  you have read
  in or created; e.g. `FETCH filename 0' will  fetch  all  the   histograms
  in file `filename'.

  It is also  possible to use  a register,  parameter etc.  as a histogram
  identifier or secondary identifier.

  For more on secondary identifiers, see HELP Secondary_Identifiers.

