Distributions of the 22 GHz H₂O masers indicated by the plus symbols with the proper motion vectors measured with respect to the barycenter. The color code indicates the LSR velocities of the maser features. The 22 GHz H₂O maser features observed in previous observations by Goddi et al. (2007) in 2005 and Burns et al. (2016) in 2010 are also plottedwith open circles and filled squares, respectively. The solid line indicates the outflow axis derived from a linear fit to the positions of all maser features, including previous results.