1 HB3_FETCH
  Syntax: HB3_FETCH filename id1 [:id2] [id3...]

  Fetches HBOOK version 3 histograms from a file. To fetch all histograms,
  give  the  command   `HB3_FETCH  filename  0'.  To  specify  a  range of
  histograms, give the  command `HB3_FETCH  filename id1:id2'. If you want
  to fetch other histograms from the same file give the command
  `HB3_FETCH id1,id2...'. If the histogram number you ask to fetch already
  exists, it  will be  overwritten. All the  histograms  will be given the
  default secondary identifier.

  WARNING: If you fetch all  histograms from a file or specify a range any
  existing HBOOK  histograms will be  deleted! However,  Mn_Fit will still
  store the   histograms  internally. This  means  that you  will lose any
  slices,  bands   projections or   functions  associated  with  the HBOOK
  histogram unless you have already extracted them into Mn_Fit plots.

