Structure of the inflow and outflow in the region close to the planet at the midplane. Panel a: result obtained from m01 at t = 50. Panel b: result obtained from m1 at t = 100. In order to distinguish the inflow and outflow clearly, we plotted v_r∕|v_r|. Red and blue correspond to the regions where v_r∕|v_r| has positive and negative values. We note that the length of the arrows does not scale with the flow speed.