$FMM group (relevant if QFMM selected in $INTGRL)
This group controls the quantum fast multipole method
evaluation of Fock matrices. The defaults are reasonable,
so there is little need to give this input.
ITGERR = Target error in final energy, to 10**-(ITGERR)
Hartree. The accuracy is usually better than
the setting of ITGERR, in fact QFMM runs should
suffer no loss of accuracy or be more accurate
than a conventional integral run (default=7).
QOPS = a flag to use the Quantum Optimum Parameter
Searching technique, which finds an optimum FMM
parameter set. (Default=.TRUE.)
If QOPS=.FALSE., the ITGERR value is not used. In this
case the user should specify the following parameters:
NP = the highest multipole order for FMM (Default=15).
NS = the highest subdivision level (Default=2).
IWS = the minimum well-separateness (Default=2).
IDPGD = point charge approximation error (10**(-IDPGD))
of the Gaussian products (Default=9).
IEPS = very fast multipole method (vFMM) error,
(10**(-IEPS)) (Default=9)
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Edited by Shiro KOSEKI on Fri Nov 5 14:55:12 2021.