Multi-epoch comparison of ⟨Φ_B⟩ angles for VLA 1 (left panel). The epochs are 2005.89 (VLBA, S11a), 2012.54 (VLBA, S14), 2014.46 (EVN), 2016.45 (EVN), 2018.44 (EVN), and 2020.82 (EVN). The two horizontal solid black lines indicate the ±90° angles. The dashed gray lines represents the best linear fit results of the data considering that the position angle of a magnetic field vector has contemporary multiple values equal to ⟨Φ_B⟩=⟨Φ_B⟩±180°. The slopes of these lines are m_VLA 1 = ( − 15° ​.38 ± 1° ​.80) yr⁻¹. Magnetic field vectors and strength along the line of sight (next to the corresponding maser feature) as estimated from all the linearly and circularly polarized maser features detected around VLA 1 (right panel) during the four EVN epochs (2014.46, 2016.45, 2018.44, and 2020.82). The vectors are superimposed to the uniform-weighted continuum map at Q-band (central frequency 44 GHz) of the thermal jet driven by VLA 1 (Rodríguez-Kamenetzky et al. 2020). For more details, see the caption for Fig. 2.