real kB; /* force constant for state B */
/* Variables not present in mdp, but used at run time */
+ double value_ref; /* The reference value, usually init+rate*t */
+ double value; /* The current value of the coordinate */
dvec dr; /* The distance from the reference group */
double vec_len; /* Length of vec for direction-relative */
dvec ffrad; /* conversion factor from vec to radial force */