[gmx-users] make index group

[Bing Bing]

 Dear all,
I'm trying to perform order parameter analysis. I 've use :-
make_ndx_d -f xxx.tpr -o sn1.ndx

> 15 & a Cxx |.......
>q

i've got this error :-
Group 15 not exist.

I did not make index before I proceed with grompp for the mdrun, is it cause
by this?

thanks.

Regards,
bing
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