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Fig. 5


Top panel: DM time series for the upper and lower halves of the observing band. We note that until MJD 56524, the observing bandwidth was only 47 MHz, which leads to worse DM precision and a smaller DM difference. Bottom panel: difference between the DM measured in the top and bottom part of the band. By definition (i.e. through selection of the standard profile) no DM difference is present at MJD 57161. While the long-term DM gradient appears consistent between the two bands, the higher-frequency DM structures are shown to affect the high-frequency band more than the low-frequency band. The second y-axis in both panels indicates the corresponding dispersive delay at an observing frequency of1.4 GHz.

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