Hi Keith--

> I used:
> 
> parameter
>   nonbond (resid X and name HN) 0.0498 4.0000   0.0498 4.000
> end
> 
> If I am correct, setting sigma to 4.000 should correspond to a
> radius of ~1.30 angstroms, which is close enough for this
> application. 
> 

Rvdw = sigma 2^(1/6) / 2

so, to get a radius of 1.3 angstrom, use sigma=2.316 angstrom.

best regards--
Charles
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