Angular profile of the column density and the maximum radial velocity in runs A6 (left panel) and C6 (right panel). The doted blue line means the column density of the matter with 3≤log(ξ/(erg s⁻¹cm))≤6 and v_r≥10⁴ km s⁻¹ and the dashed red line means the maximum radial velocity of the matter with 3≤log(ξ/(erg s⁻¹cm))≤6. The red solid line and the blue solid line show the line of v_r,max = 10⁴ km s⁻¹ and N_H = 10²² cm⁻², respectively. The shaded areas indicate where UFOs could form.