Fig. 2
Normalized Stokes parameters q (top) and u (bottom) as a function of the aperture radius (in FWHM unit) for the polarized standard star HD 283855. For this plot, the sky annulus was fixed at 6 × FWHM and 1.5 × FWHM in size. The vertical dashed lines indicate the selected apertures (3–5 × FWHM) to compute the mean Stokes parameters.
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