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Fig. 1

image

Variability of the longitudinal field (Bl) (left y-axis) and S-index (right y-axis) as a function of rotational phase for each epoch (2007.59, 2008.64, 2010.55, 2012.54, 2013.61, 2014.61 and 2015.54). For epoch 2012.54 only the S-index is plotted, as the Stokes V observations were not available (see Sect. 3). The subplots are all on the same scale for easier comparison between epochs, and the dashed line represents Bl = 0. The scale was chosen based on the minimum and maximum value.

This figure is made of several images, please see below:

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