RINGO3 data of QSO B0957+561. The Stokes parameters (qA, uA) and (qB, uB) are corrected for instrumental polarisation and depolarisation biases (see main text). In each band, we show the means and root-mean-square deviations of the Stokes parameters for each quasar image (crosses and ellipses), and the 1%, 2%, and 3% polarisation rings (dashed open circles).
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