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This directory (ex_model_Ar_P_Morse_07C_w_Extensions) contains a shifted Morse
pair potential Model written in C.

   phi(r) = epsilon * ( - exp[ -2*C*(r - Rzero) ] + 2*exp[ -C*(r - Rzero) ] )
            + shift

where shift is computed so that phi(rcut) = 0.0