Fig. 7

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Polarised-to-stellar light contrast, δpol, plotted against the apparent J-band magnitude. The right panel shows a zoomed-in view of the bright m¡. The object names are listed along the top axes. The marker colours and symbols specify the observing filter and object type, respectively. Upper limits are shown when the stellar PSF was determined to be saturated. The error bars show the 3σ uncertainties. The grey shaded region shows the approximate magnitudes (mJ ≳ 10) inaccessible by the SPHERE AO system.
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