[molpro-user] what is the meaning of the DEN1 VAR(S) VAR(P) in the title of iteration of CASPT2

[der Anbeter des Geistes]

Dear Molpro's users
I have the question on the meaning of the "DEN1" "VAR(S)" "VAR(P)" in the title of the iteration of CASPT2? Could someone explaine it for me? Thanks you
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