Density (green) and velocity map (yellow arrows: v) of the gas disk model from Picogna et al. (2019). The base of the XEUV flow (i.e. the location of the largest gradient in temperature) is shown in black, and coincides with a strong drop in density. v_r is pointing radially outwards everywhere in the wind but very close to the sonic surface where v points outwards, but away from the disk (for R < 200 AU). The cyan line represents z(R) = H; additional lines for 3.5 H (dotted blue) and 5.5 H (dashed blue) show the range of scale heights the disk surface covers.