Fig. 2
The subpulse phase tracks of three LOFAR observations of PSR B0809+74 taken in March 2009 (white points), September 2009 (black points) and September 2011 (grey points). The right panel shows the same tracks with a slope of − 25°/° subtracted and offset by ± 50°, so that fine structure is easier to see. The grey line is a spline of the most recent observation so that data can be easily compared across epochs. The shape of the subpulse phase tracks are constant to within experimental uncertainties.
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