Comparison of the H₂O maser features detected for five different ranges of velocities in VLA 1 in the four EVN epochs 2014.46, 2016.45, 2018.44, and 2020.82. The size of the symbols are scaled logarithmically according to their peak intensities. The epoch for which the maximum of the intensities is registered for each velocities range is colored in light gray. The assumed velocity of the region is V_lsr = +10.0 km s⁻¹ (Shepherd et al. 2003).