RINGO2 data of the polarised star VICyg12. The radius of the dashed open circles is the true polarisation degree, and the radius of the solid open circles is the measured polarisation degree. Top panel: instrumental Stokes parameters (q = Q∕I, u = U∕I) for 103 values of the sky position angle (observations between May 2011 and March 2012). All data points are distributed in a ring around the instrumental polarisation (cross). In the middle panel, the centre of the distribution is shifted to the origin (0, 0) by subtracting the instrumental polarisation (an elliptical distortion is also corrected). In the bottom panel, the data are de-rotated using the sky position angles associated with them.
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