Same as Fig. 1, for the non polarized standard star WD 1620391 observed with FORS2 during nights 2010-07-25 (upper panel) and 2011-03-28 (lower panel). In the upper panels, it can be seen that the polarization value is ~0.1% both in Stokes PQ and PU, while it is less in the case of lower panel, ~0.05%.
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