Left: 43 GHz VLBA images in terms of the brightness temperature T_b in the source rest frame. The right ascension of the radio core is fixed to 0. The cyan contours indicate where T_b = T_eq ≈ 5 × 10¹⁰ K. The yellow dashed lines present the location 0.6 mas from the core, a typical projected distance of Region C (0.45–0.7 mas; Weaver et al. 2022). Right: contours obtained from Stokes I images, starting from 3σ_rms level, where σ_rms represents the r.m.s noise level in a residual map. The color maps show linear polarization intensity. All the images are convolved with a beam size of 0.2 × 0.2 mas². The black bars indicate the observed polarization angle on the images where the S/N of the polarized emission is higher than 3.