The differences between front and rear are accounted for as follows. Because the subsystem is a masked block, a different data set (L, K and C) can be entered for each instance. Furthermore, L is thought of as the Cartesian coordinate x, being negative or positive with respect to the origin, or center of gravity. Thus, Kf, Cf, and -Lf are used for the front suspension block whereas Kr, Cr, and Lr are used for the rear suspension block.