1σ radial contrast levels for the data shown after the different major data-reduction steps – basic PDI by ZIMPOL, correction of the polarimetric beam shift, and subtraction of instrument polarisation (IP) – for the polarised intensity Q and for the corresponding intensity I of one single combined zero-phase and π-phase (2 × 1.2 s) exposure of α Cen A in the N_R filter.
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