*GTOL
r1, r2
r1: r*8: line extension multiplier. Default 0.d0
r2: r*8: power tolerance. Default 1.d-10
r1 controls a small extension to the heating lines. If r1=1, heating starts c1 before the line start and ends after c2 after the line end (see *GOLD card).
r2 is a tolerance for element activation. If the power in a heating line is less than this value, elements are not activated. This value is useful when lines are added with zero power to model the moving forced cooling using the *LENS card when the laser power is off.