Force contributions for the equilibrium state according to Eq. (17) for the gravitating, rigid sphere, given as a function of the Mach number. denotes the pressure force measured at the surface of the sphere, denotes the total dynamical friction calculated according to Eq. (22), the pressure force measured at the outer boundary of the computational domain, and the momentum transport through the outer boundary. The sum of these four forces is denoted by F_tot.