Hi:
every one!
 
 In the GROMOS96 source file there is a file  named as ffG53a6nb.itp that relate to nonbond interaction parameters . one found 3 items:
1.[ atomtypes ]
2.[ nonbond_params ]
3.[ pairtypes ]

The unit 'CH2' both parameterized in 1. and 2.
 
Since the GMX have already used combination rule whether an arithmetical or geometrical averaged, why there is the parameters in above 2 items ?
 
And more important is the values of these parameter is different ! Which one is the real parameter for simulation?
 
Thank in advance
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