hqpe.sc.m.F full cancellation of VXC_lda term.
In this case, results are independent whether we use GGA or VWN.
(use FRZWF=T).

However, it can gives very unstable behevior if FRZWF=F;
this is natural because no exchange-correlation effect for
(out of range) basis; Sigma affect only to functions within limited
energy range.