Au, Ag and Ni

These types specify Sutton-Chen potentials of the appropriate form.[12] Three additional real parameters must be specified using the PARAMS keyword in the odata file, namely Sutton and Chen's 9#9, c and a, in this order. The nearest neighbour distance in the prevailing unit system is 16#16. Hence, using 17#17 corresponds to a unit system where the bulk nearest-neighbour distance is 1. Subroutines used: scdiff.