Hello especially for those who are experienced using Contact Map Visualizer Plugin. About generating a contact map, after typing the following command as shown:

g_mdmat -f 2p31.pdb -s 2p31.pdb -mean contact-map.xpm

It gives us a list of group selection to analyze such as below:
 
Select group for analysis
Group 0 ( System) has 2616 elements
Group 1 ( Protein) has 2470 elements
Group 2 ( Protein-H) has 2470 elements
Group 3 ( C-alpha) has 314 elements
Group 4 ( Backbone) has 934 elements
Group 5 ( MainChain) has 1246 elements
Group 6 ( MainChain+Cb) has 1540 elements
Group 7 ( MainChain+H) has 1246 elements
Group 8 ( SideChain) has 1224 elements
Group 9 ( SideChain-H) has 1224 elements
Group 10 ( Prot-Masses) has 2470 elements
Group 11 ( non-Protein) has 146 elements
Group 12 ( Ion) has 2 elements
Group 13 ( CL) has 2 elements
Group 14 ( Water) has 144 elements
Group 15 ( SOL) has 144 elements
Group 16 ( non-Water) has 2472 elements
Group 17 ( Water_and_ions) has 146 elements
 
My question is that is it possible to modify that group selection? I want to add in group analysis on alpha helix & beta sheet.
For example Group 18 (Alpha helix) has 999 elements.
 
If it is possible? How & where can I do that?
 
Hope you reply a.s.a.p

Many thanks,
Suhaila