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To study the effect of a spin-orbit coupling, it is possible to generate
a pseudopotential with a larger or smaller spin-orbit coupling compared to
that in a real atom. The scaling factors can be specified to each angular
momentum quantum number by the following keyword:
The beginning of the description must be SO.factor, and
the last of the description must be SO.factor.
The number in the first column corresponds to that in the keyword
'pseudo.NandL', and a scaling factor is given for each pseudopotential
by the second column, where '1.0' corresponds to the spin-orbit coupling in
a real atom. One can control the strength of spin-orbit coupling by changing
the scaling factor.