[gmx-users] make_ndx problem

[minnale]

Hi Users, 
 I want to do analysis of g_density of lipidbilayer so how can I select po4 and N(CH3)3 groups seperately by using make_ndx from popc.
Can anyone tell me detail with which options use? 
I have checked in archives that create sn1.ndx and sn2.ndx files but i didnt get celarly.
Thanks in advance
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