ner_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Wavelength O O O O O O O O O O O O O O O O O O O O O O O O O O B-Citation I-Citation I-Citation I-Citation I-Citation O B-Wavelength O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-CelestialObject O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-CelestialObject O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Wavelength O B-Wavelength O O O O O O O O O O O O O O O
tokens: K1 (with PA 145 with respect to the core component), of the peak of the B3 component as observed in total intensity images. The polarization morphology resembles a limb-brightened structure. At 15GHz, the two polarized components are resolved from 2016 March, whereas in the first three epochs they are blended together, in agreement with what is found by Lister etal. ( 2018 ). At 43GHz, polarized emission from component K1 is detected during all epochs with the exception of 2015 October, whereas significant polarized emission from component K2 is detected sporadically. Polarized flux density of the sub-components of S50836710 are reported in Table 4 , while the full set of polarization images are presented in Appendix C (Fig.C1) . In the core component, we observe very high values of RM, which may exceed 5000radm 2 . The RM is highly variable with sign changes and its structure is patchy, indicating either opacity gradients and/or different components that evolve with time, expected in the case of a perturbed flow, which is moving along the jet. In the last epoch, when the radiation is optically thin at all three frequencies, we observe an RM of 1400500 rad m 2 , and an RM-corrected magnetic field direction of 585, roughly parallel to the jet direction. RM images and the associated error images at each observing epoch are presented in Fig. 11 . Figure 11. Rotation measure images (colour scale) for S50836710 overlaid with total intensity contours (left-hand column), and the associated rotation measure error images (colour scale; right-hand column). Vectors represent the RM-corrected magnetic field ( B ) vectors. Figure 11. continued. During the epochs in which component K2 has significant polarized emission at the three frequencies the RM is about 1950150 rad m 2 in 2015 August, and 1200400 rad m 2 in 2015 October and 2016 March. The RM-corrected magnetic field direction ranges between 160 and 175. Component K1 has RM values between 850120 and 180120 rad m 2 , with a tentative sign change observed in the last epoch, while the RM-corrected magnetic field direction ranges between 60 and 75, roughly parallel to the jet direction. We perform the analysis of the jet transverse structure using the data taken in March 2016, i.e. when polarized emission from both K1 and K2 components is clearly visible at all frequencies. Fig. 12 indicates the RM image and the slice considered for the analysis. A transverse RM gradient is clearly visible with K1 component showing positive RM values, while K2 component has negative RM values (Fig. 12 ). The shaded area marks regions with low polarization levels consistent with noise, where no reliable RM could be estimated. Total intensity and polarization profiles on the same transverse slice show a ridge-brightened profile and a limb-brightened profile, respectively. The transverse spectral index profile between 15 and 24GHz indicates a smooth flattening of the spectrum towards the ridge of the jet, with the