<P>
Thanks Mark,<BR>
I could do it following your suggestion.<BR>
Sarbani<BR>
<BR>
<BR>
On Wed, 24 Oct 2007 Mark Abraham wrote :<BR>
>sarbani chattopadhyay wrote:<BR>
>> hi,<BR>
>> I want to select two groups in the index file, one group consisting of only the <BR>
aromatic<BR>
>>ring of phenylalanine and the other group consisting of only the alpha carbon.<BR>
>>I want to know the way to use the make_ndx command for this.<BR>
><BR>
>After entering make_ndx, you can use "h<RETURN>" to get some primitive help.<BR>
><BR>
>In this case, you can most quickly solve your problem by hand-editing. See http://<BR>
wiki.gromacs.org/index.php/Index_File<BR>
><BR>
>Mark<BR>
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