15.22  DIVIDE 

DIVIDE [Y|Z] [FROM|TO] [EWEIGHT=n] [WEIGHT=n] {n1|"name1"} [BY] {n2|
          "name2"|FIT}
     [AVERAGE|EFFICIENCY[=ON|OFF]] [APPEND[=ON|OFF]] [NAME="name"]
          [CHECK[=ON|OFF]] [ERROR[=ON|OFF]] [POINTS|
          COLUMNS=[FROM] n1 [TO] [n2]] [LINES|ROWS=[FROM] n1 [TO] [n2]]
          [LIMITED [VLOG[=ON|OFF]] [[FROM]|TO [[X=]nx,[[Y=]ny[,[Z=]nz]]]
          [RECURSOR] [CURSOR] ] [LOG[=ON|OFF]]
This  divides the Y values in data set n1 by data set n2.  The result is a
modified set n1.  You may not divide normal 2-d data by mesh data.