By default, numerical gradients are computed with respect to all variables on which
the Z-matrix depends, or for all coordinates if there are no variables or `XYZ` inputstyle is used.
One can define subsets of active variables using

`ACTIVE,`*variables*

If this card is present, all variables which are not specified are inactive. Alternatively,

`INACTIVE,`*variables*

In this case all variables that are not given are active.

molpro@molpro.net 2018-07-22