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Fig. A.1


Comparison between the correction factor that minimizes the instrumental polarization and the air mass of the observed unpolarized standard stars. The dashed line corresponds to the mean value of the computed correction factors. In contrast to ISAAC/VLT (Bertrang et al. 2014), we do not find a correlation between the instrumental polarization and the elevation angle of the telescope, respectively, the airmass of the object.

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