JC

This uses Murrell's two- plus three-body potential.[#!murrellm90!#,#!murrellr90!#,#!alderzijmr91!#,#!eggenjlm92!#,#!fengjm93!#] A file JMparams must exist in the current directory containing the parameters c₀, c₁,…, c₁₀, r_e, D, a₂ and a₃. Subroutines used: jmec, jm2c, jm3c.