What do these two mean in an active-space CR-EOMCCSD(T) calculation input?

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Forum Vet

3:18:00 AM PDT - Sun, Jul 9th 2017
Dear NWCHEM developers It is very possible that the active-space CR-EOMCCSD(T) method should be chosen so that the results would be in line with those obtained by GAMESS. What do "emin_act -0.5" and "emax_act 1.0" mean on the first two lines on p.295 in NWCHEM6.6 input documentation? Could you please explain them to me? Thanks a lot! Very Best Regards! Thanks! I got it from the document. The two together define the energy window.