So accordance with Justin's and your statement, SOL_CL_NA coupling would be a 
proper option. right?


Thanks for your suggestions

Sincerely,
Shima


________________________________
From: Gunther Lukat <g.lu...@gmx.net>
To: Shima Arasteh <shima_arasteh2...@yahoo.com>; Discussion list for GROMACS 
users <gmx-users@gromacs.org> 
Sent: Thursday, March 21, 2013 4:31 PM
Subject: Re: [gmx-users] T-Coupling groups in NVT


I general, I have good results with coupling Ions together with the water. 




Dipl.-Inf. Gunther Lukat
g.lu...@gmx.net
www.aplvoro.org



Am 21.03.2013 um 13:56 schrieb Shima Arasteh <shima_arasteh2...@yahoo.com>:

Hi,
>
>I am simulating a system of POPC/Water/Ions/protein.
>Ions are 1 M NaCL and 3 CL atoms to neutralize the system.
>
>In NVT step, I have coupling groups as :
>tc-grps        = Protein POPC    SOL_CL    
>
>comm_grps    = Protein_POPC SOL_CL
>
>when I run the grompp for NVT, I get the error that the 615 Na atoms are not 
>part of any of the T-Coupling groups.
>
>Now, I 'd like to know if I need to couple Na with SOL_CL such as SOL_CL-Na ? 
>Or I need to create a seperate group for Na?
>
>Would you please give me suggestions?
>Thanks in advance.
>
> 
>Sincerely,
>Shima
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