Spectral index maps generated by applying the identical analysis as conducted in Section 3.2, but using synthetic data without (left) and with (right) gain corruptions. Deviation from a zero spectral index can be ascribed to different (u, v) coverage between the 22 and 43 GHz data, along with imperfections in gain calibration and imaging procedures. While deviations are indeed evident in certain regions of the jet, particularly in the image on the right due to gain corruptions, there is no indication of a significantly inverted spectrum near the knot’s deflection point, as observed in the real data.