Thanks Mark! This is exactly what I need. 

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> Date: Wed, 15 Aug 2012 22:18:10 +1000
> From: mark.abra...@anu.edu.au
> To: gmx-users@gromacs.org
> Subject: Re: [gmx-users] Parameters for bonded interactions
>
> On 15/08/2012 8:44 PM, Sebastien Cote wrote:
> > After checking the post-processed topology, it does not contain the 
> > information that I need. I would like to know the torsion angle parameters 
> > of each torsion angle, and then compare with the ffbonded file to see the 
> > corresponding four-atom groups ' X X X X '.
> >
> > Is there a way to convert the .tpr file to 'human readable'?
>
> Sorry, meant to say that last email. gmxdump is all that is available.
> You'll have to work backwards from the atom numbers (starting counting
> from zero!) to get the interaction number to look up the interaction
> parameters from their list.
>
> Mark
>
> >
> > Thanks again,
> >
> > Sebastien
> >
> > ----------------------------------------
> >> Date: Wed, 15 Aug 2012 11:48:00 +1000
> >> From: mark.abra...@anu.edu.au
> >> To: gmx-users@gromacs.org
> >> Subject: Re: [gmx-users] Parameters for bonded interactions
> >>
> >> On 15/08/2012 9:46 AM, Sebastien Cote wrote:
> >>> Dear Gromacs users,
> >>>
> >>> In the topology file of the protein, we see every two atoms that share a 
> >>> bond, three atoms that share a bond angle, and four atoms that share a 
> >>> torsion angle. However, the parameters (equilibrium value, energy 
> >>> constant, phase) are not explicitly shown as Gromacs fetch them in the 
> >>> ffbonded table. My question: Is there a simple way to see (without having 
> >>> to look at the code) which parameters are associated to which bond 
> >>> length, bond angle and torsion angle?
> >>>
> >>> More specifically, I would like to know which torsion angle parameters is 
> >>> specifically associated to each torsion angle. In the ffbonded table, 
> >>> there is sometimes different groups of four atoms that can be associated 
> >>> to the same torsion angle as there is the 'X' atom which can be any atom.
> >> grompp -pp writes out a post-processed topology, which may be what you 
> >> need.
> >>
> >> Otherwise you can inspect the contents of the .tpr file to see which
> >> interaction gets which parameters. That is not easy for a large system,
> >> but is definitive.
> >>
> >> Mark
> >> --
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