If the directive

`VARSAV`

is given, the gradient is saved in variables `GRADX`, `GRADY`, `GRADZ`. `GRADX(n)` is the
derivative with respect to for the -th atom. The atoms are in the order as printed. This order
can be different from the order in the input z-matrix, since the centres are reordered so that
all atoms of the same type follow each other.

molpro@molpro.net 2018-08-15