Fig. 1

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Example of profile variations of PSR J1012+5307 at EFF, with each color representing a peak-normalized observation taken at a certain date, as indicated in the legend. A zoomed-in view of the leading component of the main pulse is shown in the subplot. These variations are not found in other telescopes, and thus we attribute them to the fact that we did not polarization-calibrate the EFF data.
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