From: Balazs Jojart (
Date: Wed Mar 17 2010 - 13:29:27 CDT

other possibility:
change allthe Na+ and Cl- in the parameter file to SOD and CLA.
It doesn't effect the other parameters, and after that, the 'ion' or
'ions' keywords are working.

DimitryASuplatov wrote:
> Hello,
> I am running NAMD simulation in AMBER ff and eventually I want to make
> an index file excluding water and ion molecules in VMD.
> The problem is that selecting RESNAME NA+ CL- always throws en error.
> I guess VMD does not like "+" and "-" signs. I`ve tried to mask them
> with \\, {}, (), "", '' though it did not help.
> Does anyone know how to make a selection of resname Cl- and Na+ in VMD?
> Thank you.