bound_relax_factor:

Factor for initial relaxation of the bounds. $\;$
Before start of the optimization, the bounds given by the user are relaxed. This option sets the factor for this relaxation. If it is set to zero, then then bounds relaxation is disabled. (See Eqn.(35) in implementation paper.) The valid range for this real option is $0 \le {\tt bound\_relax\_factor } < {\tt +inf}$ and its default value is $1 \cdot 10^{-08}$.