coefficients for fs potential in copper (original) 29.059214 -140.05681 130.07331 -17.48135 31.82546 71.58749 1.2247449 1.1547054 1.1180065 1.000000 0.8660254 0.7071068 9.806694 16.774638 1.2247449 1.0000000 3.615 10.61e-26