The definitions of the CASSCF wavefunction may also be specified
manually using some or all of the directives:
`OCC`
- Occupied orbitals.
`CLOSED`
- Closed-shell orbitals.
`FROZEN`
- Frozen-core orbitals.
`WF`
- Wavefunction card.
`STATE`
- Number of states for this wavefunction symmetry.
`WEIGHT`
- Weights of states.

For the exact definition of these cards see sections 19.2
and 19.3. These commands may also be used to modify the
values defined in `VBDUMP`.
The information given on these cards should correspond to
the CI vector saved in the CASSCF calculation. The cards, and their ordering,
should therefore coincide with those used in *MULTI*,
except for the `WEIGHT` cards which may differ.
At present, the VB wavefunction must correspond to a well-defined number
of electrons and total spin. Other states may be present, but an error
condition will occur if non-zero weights are specified for wavefunction
symmetries with varying values of *elec* or *spin*.

molpro@molpro.net 2019-01-16