Faraday rotation results for the blazar TXS 2013+370. Left: Pixel-based map of intrinsic RM. Dashed lines correspond to the outermost total intensity contours of the 22 GHz (black) and 43 GHz (red) maps. Solid contours are set to 2, 4, 8, 16, 32, and 64% of the 86 GHz peak polarized intensity (0.70 Jy /beam). All maps have been convolved with a common beam, the equivalent circular beam of the 86 GHz map, which is shown as a gray circle in the bottom-left corner. Middle: Linear fit of Eq. (1) after unwrapping the nπ ambiguities showing EVPA rotation from 86 GHz to 22 GHz. The slope yields an integrated RM of (7.81 ± 0.16)×10⁴ rad m⁻² for the core region. Right: Pixel-based map of RM uncertainties from the covariance matrix of the per-pixel least-square fits.