Total intensity of the knot, measured in Jy per beam, is plotted against time. The uncertainties are obtained by combining the image rms errors and the 10% systematic errors arising from the uncertainties in visibility amplitudes through quadrature. The blue and red dashed lines represent the best-fit linear functions for the observed intensities prior to and after mid-2022 (indicated by the black vertical dashed line), respectively. This transition coincides with a sudden acceleration in the knot’s apparent speed.