slack_bound_frac:

Desired minimum relative distance from the initial slack to bound. $\;$
Determines how much the initial slack variables might have to be modified in order to be sufficiently inside the inequality bounds (together with "slack_bound_push"). (This is kappa_2 in Section 3.6 of implementation paper.) The valid range for this real option is $0 < {\tt slack\_bound\_frac } \le 0.5$ and its default value is $0.01$.