Observed distance on the plane of the sky of the reference point of the NE (maroon circles) and NW (magenta squares) lobes. The magenta solid line and blue dashed line show the fits to the observed extents of the NW and NE lobes, respectively, assuming constant expansion. The magenta dot-dashed and green dotted line shows a fit to the extent of the NW and NE lobes, respectively, assuming a ballistic trajectory for a star with 1.2 M_⊙. The black intervals mark the uncertainty interval on the ejection times of the lobe to the NE based on the two models.