Fig. 3
Upper panel. Shape of the SQ galaxy NGC 7318b (thin line) and the bow shock (thick line) at t = 130 Myr (j = 0, 
). A perfect gas with γ = 5/3 and an upstream Mach number of M∞ = 930 have been assumed. Lower panel. Normalized pressure 
along the galaxy surface (i.e. along the body streamline) (dashed line) and directly behind the bow shock wave (solid line).
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