Watermasers detected in our VLBA images above 10σ at each epoch. The images show the emission from the channel at vLSR = 6.1 km s−1. Contour levels are 0.3, 0.4, 0.5, 0.65, 0.80, and 0.95 times the peak level on the images, which are given in Table 1. The blue strips indicate the RA position with error bars of the shock front (see Sect. 3.2.)
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