Radio continuum spectral-fitting results. Top: radio continuum spectra as a function of distance along the stripped tail. Spectra are extracted from the apertures shown in Fig 6, and distance along the tail increases in each panel from left-to-right and top-to-bottom. Measured flux densities are shown with the black data points and the best-fit spectral model is shown by the solid black line. Red shading shows the 68, 95, and 99.7 per cent model credible regions. Bottom: best-fit JP model parameters (normalization and break frequency) as a function of distance along the tail.