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Model driver for the three-body Kaxiras-Pandey potential presented in

Kaxiras E, Pandey KC (1988),
New classical potential for accurate simulation of atomic processes in Si.
Physical Review B 38 12736-12739. 
doi: 10.1103/PhysRevB.38.12736

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

species
A1 	[eV]
A2 	[eV]
alpha1 	[Angstrom^-2]
alpha2 	[Angstrom^-2]
B 	[eV]
D 	[eV]
beta 	[Angstrom^-2]
C 	[Angstrom]

