Results from the turnover frequency analysis. Left panel: turnover frequency for each pixel obtained by fitting the synchrotron spectrum across five frequencies between 5 and 43 GHz. The constant turnover values in the direction perpendicular to the jet propagation point out that the transversal structure is not resolved. The turnover frequency is clearly seen to decrease as going further from the core. The black pixels are spurious data points arising from a not successful fitting of the data. Right panel: brightness at the respective turnover frequency. In both maps, the contours are from the 43 GHz map.