Normalized azimuthal density profile of the inner and outer wakes at radial distances  ± 4/3H away from the planet at 30 T_orb for the isothermal 2D standard model. The coordinates x and y refer to local Cartesian coordinates, see Eq. (15). The “plus” sign in the x-axis label refers to the blue curve at r_p − 4/3H, and the “minus” sign to the red curve at r_p + 4/3H. The upstream side of the wake is to the left for both curves.