Pulse-shape variations for PSR J2219+4754. Shown are the profile-shape differences between the observations and the standard template, which is indicated by the dashed horizontal line at MJD 57161. The vertical line indicates the position of the peak of the pulse profile. For a clearer view, only one observation is plotted for every four-week interval. The pulse profiles used for this plot were fully averaged in frequency and downsampled to 256 profile bins (to reduce the radiometer noise in the plot). The differences between observations and standard template were calculated after peak-normalising and aligning the profiles by their leading edge and peak. This figure is consistent with Fig. 4 of Michilli et al. (2018), who used a slightly extended dataset.
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