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Fig. D.1.

image

Normalized Stokes parameters q and u as a function of aperture radius for the observations of the unpolarized star HD 217343 (2018) in the H-band. The central and outer dashed lines indicate the radii of the apertures from which the normalized Stokes parameters and their error bars (see Figs. 9 and D.5) have been determined, respectively.

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