Vertical and lateral motion of overflowing stream, relative to the motion toward the accretor, in the plane normal to the binary axis and intersecting the Lagrangian point (magenta cross), with the Coriolis force. Gas with $\stackrel{\sim }{\rho }<{10}^{-3}$ (white background), which contributes negligibly to the overflowing stream, is masked out for better visualization. ${\stackrel{\sim }{v}}^i$ (i = x, y, z) is the i^th velocity component relative to the Lagrangian point. In both cases – adiabatic (left) and isothermal (right), we assume an equal-mass binary. The hatched areas indicate the velocity ratios less than 0.05, suggesting that the gas may be assumed to be in hydrostatic equilibrium. The arrows show the overall motion of the stream.