Water (triangles) and 6.7 GHz methanol (circles) masers in IRAS 20126+4104. The cones indicate the 3D velocities of the maser features with respect to the star, for the H₂O masers, or relative to feature 3 (marked with a cross), for the CH₃OH masers. Points without an associated cone have been detected only over one or two epochs and the associated proper motion cannot be computed or is considered unreliable. The cone opening angle corresponds to the 1σ uncertainty, due to the error on the proper motions. The length of the cones is proportional to the speed, with different scales used for the two maser types as indicated in the figure. The colours correspond to the line of sight velocities, as shown in the colour scale to the right. The starred polygon marks the location of the star, obtained from the model fit to the H₂O maser positions and 3D velocities. Labels “1” and “2” denote two elongated groups of CH₃OH maser features. The dotted line outline the projection of the bipolar H₂O maser jet onto the plane of the sky, while the dashed line is a linear fit to the CH₃OH maser features of group 1.