Slices of density in units of ﹩{\rho }_{\infty }﹩ for the simulation suite (Γ_s, γ) = (4/3, 4/3) (left panels) and for the simulation suite (Γ_s, γ) = (5/3, 5/3) (right panels) through the orbital (x–y) plane, for a fixed upstream Mach number ﹩{{ \mathcal M }}_{\infty }﹩ and varying ratio q_r. The simulations for each γ use ﹩{{ \mathcal M }}_{\infty }=1.69﹩ and q_r = 0.1 (top) and 0.33 (bottom). The slices compare the state of the flow at simulation time ﹩t=30{R}_{{\rm{a}}}/{v}_{\infty }﹩. The panels show the dependence of the flow pattern around the embedded companion object in a specific region of the envelope on the binary mass ratio.