(a, b) Proper motion of T Tau N as measured by the VLA in right ascension and declination, respectively. The fitted proper motion (solid lines) agrees well with that measured by Hipparcos. (c, d) Proper motion of T Tau S in right ascension and declination, respectively. The fitted proper motion of T Tau S is plotted as solid lines (the fit excludes the 2001.053 data points). The proper motion of T Tau N is plotted as dashed lines.