It is proposed to use, as a reference surface, the smoother physical surface of Mars, which is an expansion with respect to normalized spherical functions to the 16-th power. The coefficients of the expansion are determined on the basis of the coefficients of the expansion of the relief and the gravitational potential to the 12-th power. Pictures of the variation in gravitational force with respect to $g_0$ = 372.69 Gal and plumbline deflection at the smoothed physical surface are given.
Sternberg State Institute of Astronomy, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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