Arbitrary reference number assigned to the resulting variable (2 to NV (NUMVAR)). If this number is the same as for a previously defined variable, the previously defined variable will be overwritten with this result.

Reference numbers of the two variables to be operated on.

Unused field.

Thirty-two character name identifying the variable on printouts and displays. Embedded blanks are compressed for output.

Unused fields.

Scaling factors (positive or negative) applied to the corresponding variables (default to 1.0).