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A variant of the IPEA shift of G. Ghigo, B. O. Roos, and
P.A. Malmqvist, Chem. Phys. Lett. 396, 142 (2004) has been added. The implementation is not exactly
identical to the one in MOLCAS, since in our program the singly external configurations are not (RS2)
or only partially (RS2C) contracted. The shift is invoked by giving option IPEA=shift on the
RS2 or RS2C commands; the recommended value for shift is 0.25. For details of the implementation see manual.
molpro@molpro.net 2012-02-09