[gmx-users] helical parameters for DNA

[shahab shariati]

 Hi gromacs users

I want to simulate pr-dna by gromacs.I read a article (Biophysical Journal
87(6) 3799–3813) inwhich helical parameters for DNA (rise, slide, twist,
roll, tilt, shift) calculated by md simulation, but I did not understand two
things:

How and what command these parameters were calculated?

I read gromacs manual. in that there is only  g helix  and  g helixorient
for Protein specific analysis.

can any body help me how to do this ?
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