Hello, I would like to calculate the RDF between some ions and oxygen atoms of a polymer. The polymer has ester functional group with two different atom types O and OS according to GAFF. It has also a side chain with ethereal oxygen which has the same atom type as the ester part. How can I specify the O of the side chain in the index file to tell it apart from the other O atoms? Besides there are around 500 of this atom in the system so changing something manually is not a good option either.
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