Fig. 4.
Normalized Stokes parameter diagram. Top panel: the source (black filled circles) and a field star (empty red circles) for observations spanning the period 2013–2017. Middle panel: source observations during 2016 (no X-ray outburst). Bottom panel: source observations during the 2017 outburst. The numbers indicate the flow of time, where number 1 corresponds to the older observation.
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