Parallax and proper motion data (markers) and a best-fitting model (dotted lines) that uses a combined estimate for the parallax and proper motion for the maser spot at the V_LSR of 6.48 km s^-1. Plotted are positions of the maser spot relative to the extragalactic radio sources J2044 + 4005 (circles), J2046 + 4106 (squares) and J2049 + 4118 (triangles). Left panel: eastward (upper panel) and northward (lower panel) offsets versus time. Right panel: same as the left panel, except the best-fitting proper motion has been removed, displaying only the parallax signature. (This figure is available in color in electronic form.)