Dear justin, Thanks for your useful suggestions but not the right way to post these things. Anyway Dear I have already read the link mentioned by you and know very well what does -extr do actually I want to extract some minimum energy structure for docking studies from 12500 ps to 15000 ps MD trajectory out of total 15 ns MD run. For this, I have extract structures along 50 eigenvectors structures. Therefore, I want to confirm the values in second column whether they are energy values or not.
-- Pawan
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