Defines a variable *name* which holds the energy value to be used
for computing the hessian using finite differences.
By default, this is `ENERGY(1)` as set by the most recent program.
For other other variables which can be used see section 46.2.17.
Note that numerical hessians
cannot be computed when dummy atoms holding basis functions are present.

molpro@molpro.net 2019-01-15