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[zmq.lyao@gmail.com]

Dear all,
   When I do a RF calculation, I set nband=the number of occupied bands (not 
including empty bands) for the convergence of d/dk calculation. However,  if 
I also set the nband=the number of occupted bands in the first step GS 
calculation,the calculated dielectric constant(Anaddb analysis) is much 
smaller than that from the GS calculation including empty bands. But the 
former is closer to the experimental value. I don't know why the number of 
empty bands have so big influence on the dielectric constant. Do I need to 
include enough empty bands in the first step GS calcualtion? Thanks in 
advance.

regard,
ZM