Comparison of the point where υ_x,g has the maximum value at the midplane and the assumed outflow point, (the open circle on the dashed-dotted circle). The results were obtained from m02 − hw003 (panel a), m05 − hw0 (panel b), and m1 − hw0 (panel c). The star symbols denote the points where the flow speed in the positive (the red star) and the negative (the black star) x-direction has the maximum value in the limited region, (the ranges of the x- and y-axes of these panels), and . The flow speed at the star symbol was plotted in Fig. 9a with the same color star symbol.