Top. Positions of the two persistent H₂O maser features in IRAS 20126+4104 at the six epochs of our VLBI observations. Note that the reported positions have been suitably offset from the measured positions for displaying purposes. Green and red circles indicate features at –6.4 and –3.2 km s^-1, respectively. Their positions at the 2^nd observing epoch are and , for the feature at –3.2 km s^-1, and and , for the other. The solid and dashed curves with open circles are the best fits, consisting of the apparent motion due to the annual parallax for a common a distance of 1.64    ±    0.05 kpc for both features plus a constant velocity in the plane of the sky different for each feature (see text). Bottom. Residual motions in right ascension and declination, obtained after subtraction of the constant velocities. The curves are the fits consisting only of the annual parallax. The solid and dashed curves correspond, respectively, to the RA and Dec offsets.