Dear All,
         
        I want to calculate the rdf of a particular residue with respect to 
water, I was able to generate the rdf of the entire protein against the bulk 
water,but I could not do the same  for a particular residue, In the index.ndx 
file I have specified the groups of that particular residue, but how can I 
correlate it with the bulk water ? 
            I think I should generate an .ndx file with  all the atoms I need 
as well as the solvent molecules, but I have some basic problem in 
understanding the preparation of .ndx file, when I am executing the commnad 
make_ndx and select system, index file is being prepared, but there I can not 
specify groups , everytime  it is said that group is empty, I am doing some 
mistake , but can not detcet it, please help in this two matters.
   
  regards
  SANGEETA
          



                                
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