Sometimes one wants a guarantee that the CI vector is phase matched to
that of a previous geometry. This can be achieved by using
`SAVE,CI=`*record.file* (see section 19.5.5) in the first job, and in the
restart,

`CIGUESS,`*record.file*

The phase convention applied for the rest of the calculation is then that, for each optimised state, the largest coefficient in the original CI vector defines the sign of the corresponding coefficient in the optimised vector.

molpro@molpro.net 2018-08-14