Specifies a starting guess for valence bond orbital number . The guess is specified
in terms of the active MOs defining the CASSCF wavefunction.
(Note that the
definition of these MOs will depend on how the CI vector was dumped - i.e. which of the
SAVE, NATORB, CANONICAL, or LOCALI
directives was used (see section 19.5.5). Use of one of
the three latter keywords is recommended.)