Spatial profiles of the mass density close to the area of the detection points with zoomed areas at t = 100 s for the case of the gravitationally stratified solar corona. The left part a) corresponds to the longer scale-height whereas the right part b) of the figure shows the area for the shorter scale-height. The black arrows represent the plasma velocity vectors. The mass density is expressed by colors which correspond to the ratio of the local mass density to that in the perturbation point, L_P, in the initial time.