Dependence of the flow deflection angle with respect to the shock angle for different Mach numbers M₁ (solid lines). The black, blue, magenta, and red lines correspond to M₁ = 1.1,4,10,and100, respectively. To the right of the dotted vertical lines a physical solution exists for the corresponding Mach number, while to the left it does not. The dashed lines show the dependence of the shocked Mach number M₂ from the shock angle ϑ (scale on the right vertical axis). If M₁ varies, this does not lead to strong variations of ϑ around the sonic points, where M₂ = 1 and ϑ ≈ 57 − 64 deg for all Mach numbers M₁. But the variation of the flow deflection angle ϕ (left vertical axis) is large, as shown by the green dashed line. This line also separates the region between the weak solution (M₂> 1, left from the green dashed line) and the strong solutions (M₂< 1 right of the green dashed line). At this green dashed line M₂ = 1 is close to the cyan dashed line, where the shock angle (ϑ) reaches a maximum.