Density pulse model results. The xz-plane cross sections are centered at Trappist-1e (see Sect. 2). Positions are given in planetary radii. Arrows depict velocity vectors and their colors velocity magnitudes (left color bar). Contours indicate plasma density (right color bar). Black and magenta lines indicate interplanetary and planetary magnetic field lines projected onto the xz-plane, respectively. We display the cross sections before the CME shock (top), during the shock crossing (upper middle), during the shath (bottom middle) and during the CME peak (bottom). Each column is for a specified intrinsic magnetic field strength, Bp.