gmxmake_ndx[-f[.gro/.g96/...]][-n[.ndx[...]]][-o[.ndx]]. nr:group!'name'nrname'splitch'nrEnter:listgroups. 'a':atom'del'nr'splitres'nr'l':listresidues. 't':atomtype|'keep'nr'splitat'nr'h':help. 'r':residue'res'nr'chain'char. Copiedindexgroup2'Protein-H'