You may first use make_ndx to create the index file then use trjconv to save 
the sub-system.

On Jan 12, 2010, at 7:14 PM, zh.li wrote:

> Dear all,
>  
>      I want to remove the water molecules in the original traj file (run.xtc) 
> to save the space, so that I should use the command “trjconv”. But I don’t 
> know which sub-command I should use to realize that? Does anyone here know 
> how to do it? Thank you very much.
>  
> Zhenwei Li
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