a) VLA map of main-line OH masers for the epoch 1991 (Argon et al. 2000). Right- and left-hand polarised features are shown with different symbols. Spots’ radial velocities are indicated, those of left-hand polarised features are in italics. An asterisk marks the presumed location of the central star for the OH maser source based on the arc shape. b) Positions of VLA H2O maser spots in June 1984 (Forster & Caswell 1999). On both maps the 100 AU bar corresponds to the trigonometric distance of 2.4 kpc (Immer et al. 2013). Spots’ radial velocities are indicated. Dotted curves show the preferential direction of the growth of the spots’ radial velocities.
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