1 DIVIDE
  Syntax: DIVIDE 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

  Divides two  histograms (id1, id2)  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 divide 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,
  `DIVIDE  300:400&1 300:400&2  300 :  400 &  10' will  divide  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.

  If you really want to calculate an efficiency and the numerator is a
  subset of the denominator you should use the `EFFICIENCY' command.

