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#    Daniel S. Karls
#    Ellad B. Tadmor
#    Ryan S. Elliott
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# Contributors:
#    Kevin M. Schmalbach

This is a three-body potential implementation of a similar form to the 
Stillinger-Weber potential for silicon with an amended angular potential presented in

Gong, X.G. (1993),
Empirical-potential studies on the structural properties of small silicon clusters.
Physical Review B 47(4):2329-2332. doi:10.1103/PhysRevB.47.2329

This driver reads in one parameter file with the species followed by
nine parameters (required units indicated in square brackets following
the parameter):

species
A 	[unitless]
B 	[unitless]
p 	[unitless]
q 	[unitless]
a 	[unitless]
lambda1	[unitless]
gamma 	[unitless]
c0	[unitless]
c1	[unitless]
sigma 	[Angstrom]
epsilon [eV]
