MAP_COMBINE CODE
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MAP_COMBINE CODE

            [CLEAN\]MAP_COMBINE OutCube CODE In1 In2 [Off] [/FACTOR A1 A2]
          [/THRESHOLD T1 T2] [/BLANKING Bval]

          CODE is the operation code. Allowed values are
        ADD      or PLUS    OutCube = A1*In1 + A2*In2 + Off
        SUBTRACT or MINUS   OutCube = A1*In1 - A2*In2 + Off
        DIVIDE   or OVER    OutCube = A1*In1 / A2*In2 + Off
        MULTIPLY or TIMES   OutCube = A1*In1 * A2*In2 + Off
        OPACITY             OutCube = -Log( A1*In1 / A2*In2 + Off)
        INDEX               OutCube = Log( A1*In1 / A2*In2) / Log(Nu1/Nu2)
        where Nu1 is the Frequency of In1, and Nu2 that of In2.  Off is 0 if not
        specified.

          With the "intuitive" mathematical syntax,
              MAP_COMBINE OutCube = [A1*]In1 Oper [A2*]In2 [Off]

        Oper  can  be any of the above values for CODE, or one of the 4 standard
        operators, +-/*, and scale factors are given in a natural way,  default-
        ing to 1 if not present.