1 MULTIPLY
  Syntax: MULTIPLY id1[:id1n] [&idb1] id2[:id2n] [&idb2] id3[:id3n] [&idb3]
          [scale1] [scale2]                       (default scale = 1.0 1.0)
   where: id1,id2   are the input histogram identifiers
          id3       is the output histogram identifier
          idb1,idb2 are the (optional) input secondary identifiers
     and  idb3      is the (optional) output secondary identifier

  Multiplies two histograms (`id1,  id2') together to make a third one. To
  specify the  secondary  identifier,  precede it by a  `&', otherwise the
  default will be used. (Use the `SET IDB' command to change the default).
  The scale factors  are optional. To  avoid confusion,  you should give a
  `<CR>' after the identifiers or make sure the scale factors are given as
  real numbers.

  To multiply a range of histograms,  the primary identifiers you give for
  the input and  output histograms  must be the same,  but you can specify
  different secondary identifiers.  For example,
  `MULT 300:400&1  300:400&2 300 : 400 & 10'  will multiply all histograms
  with  primary  identifiers 300 to  400 and  secondary  identifiers 1, by
  those with secondary identifiers 2,  putting the results into histograms
  with the same  primary identifiers  and secondary  identifier 10. If you
  give primary identifier 0, the  operation will be performed on all plots
  with the given secondary identifier.

