Hi everybody, I want to make an index with "make_ndx". But when I just wanted to group SOL and CL and Protein and DPPC it tells me when I want to run grompp afterwards that there are some residues not indexed. I thought that that might be because the NA-ions are not grouped. But when I want to group them together with the SOL and the CL with the command 14|15|17 and run grompp afterwards it tells me that the index SOL_Cl could not be found. That is reasonable since my group is called: NA_CL_SOL So my question is: how can I rename such a index group?
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