[gmx-users] restrain a part of ions!

[nanyu101 at sina.com]

Dear gmx-users,

   How can I restrain only a part of ions in my system, such as Ca2+ and CL-. If I want to restrain Ca2+, can I use this method in my posre.itp/

[ position_restraints ]
;  i funct       fcx        fcy        fcz
   CA    1       1000        1000       1000

many thanks..
Best wishes,
nanyu
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