[gmx-users] how to select 'P' atom for g_msd

[sudheer babu]

Hi Users,
             I want to calculate lateral diffusion coefficent of popc
bilayer by using g_msd , the information I understood from one journal (
http://dx.doi.org/10.1063/1.2393240) is that  P atom select  and feed to
g_msd command . I have to take only single P atom or all Patoms of POPC
biliayer ? and how can i select by using make_ndx? Could you please tell me
Thanks in advance.
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