Close-up view of the 22 GHz H₂O maser features detected around the radio sources VLA 1 (left panels) and VLA 2 (right panels) in epochs 2014.46 (top panels), 2016.45, 2018.44, and 2020.82 (bottom panels). The reference positions are reported in Table 2. The letters A, B, and C indicate the position of the three maser groups identified around VLA 1 by S11a and they are reported here only for reference. The octagonal symbols are the identified maser features scaled logarithmically according to their peak intensity (Tables A.1-A.8). Maser LSR radial velocities are indicated by color (the assumed systemic velocity of the region is V_lsr = +10.0 km s⁻¹; Shepherd et al. 2003). The linear polarization vectors, scaled logarithmically according to the polarization fraction P_l, are overplotted. In the bottom-right corner of all panels the error-weighted orientation of the magnetic field (⟨Φ_B⟩) is also reported; the two dashed segments indicate the uncertainties.