Vertical structure of the gas flow. The results were obtained from m02-hw0 (panels a and b), m02-hw01 (panels c and d), and m05-hw0 (panels e and f). Left column: same as the left column of Fig. 8, but the color contour represents υ_x,g averaged in the y-direction within the calculation domain of hydrodynamical simulation. Right column: the x-component of the gas flow velocity averaged in the x- and y-directions within the calculation domain of hydrodynamical simulation, (yellow) and (blue). The dashed lines were obtained from hydrodynamical simulations. The solid lines are the fitting formula (Eq. (32)).