H₂ line emission from the IRAS 20126+4104 region, with overlayed the 3.6 cm continuum map (dotted contours) from Hofner et al. (2007) and the H₂O maser spots (green points) with associated proper motions (arrows) from Moscadelli et al. (2011). The solid contours correspond to the intensity levels marked in the colour scale on top of the figure. The yellow star marks the nominal position of the protostar, obtained from the model fit of Moscadelli et al. (2011) to the H₂O maser positions and velocities. The dashed line is the symmetry axis of the “mushroom-shaped” H₂ line emitting feature in the top right of the figure.