[gmx-users] index file

[Elisabeth]

Dear gromacs users,

I am planning to produce C-C rdf for my system and I have difficulty making
the index file with a group of all C in the system, [Carbon] . .If there are
thousands of atoms in the system do I have to go through the top file and
note down C atom numbers and use those numbers to make a group in the index
file? What is the easiest way of doing this using make_ndx features..

Thank you for your hints..
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