I am trying to calculate spatial distribution function 
(SDF) for ionic liquid.I want to see the distribution of anion around cation. I 
followed the steps given in gromacs manual.I created two groups each of single 
cation and all anions in the index file and did two steps trjconv_d to get 
trajectory for centered solute by removing translational and rotational degrees 
of freedom. When I am running g_spatial_d on this trajectory I am only able to 
see anions in my cube file as I am selecting anions for writing output 
co-ordinates. Am I following correctly or doing something wrong ? I am using 
updated gromacs version 4.5.4. Please I would really appreciate if someone can 
help this?
     Thank you in advance.
     Pre

--- Begin Message ---
 Hello everyone,
                I am trying to calculate spatial distribution function (SDF) 
for ionic liquid.I want to see the distribution of anion around cation. I 
followed the steps given in gromacs manual.I created two groups each of single 
cation and all anions in the index file and did two steps trjconv_d to get 
trajectory for centered solute by removing translational and rotational degrees 
of freedom. When I am running g_spatial_d on this trajectory I am only able to 
see anions in my cube file as I am selecting anions for writing output 
co-ordinates. Am I following correctly or doing something wrong ? I am using 
updated gromacs version 4.5.4. Please I would really appreciate if someone can 
help this?
 Thank you in advance.
 Prema.

--- End Message ---
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