JC

This uses Murrell's two- plus three-body potential.[48,49,50,51,52] A file JMparams must exist in the current directory containing the parameters $c_0,\ c_1,\ldots,\ c_{10},\ r_e,\ D,\ a_2$ and $a_3$. Subroutines used: jmec, jm2c, jm3c.