0.8 4.078 copper/gold 0.02397242934 0.945258081 0.0 0.0 0.0 0.0 4.224 3.264 0.0 0.0 0.0 0.0 4.000 this is the Cu/Au pair potential, in double spline form, which we've all been waiting for. it gives ordered Cu/Au alloys of formula Cu3Au, CuAu3 and CuAu and fits well with the observed alloying energy.