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Fig. 9.

image

Polarimetric efficiency in H band as a function of the parallactic angle and altitude angle when the derotator is in field-tracking mode without an additional derotator offset. The dashed line shows the parallactic and altitude angle of TW Hydrae across the sky, with the solid line showing the angles during the SPHERE observation. Default derotator settings (north is up on the detector) clearly yield mediocre polarimetric efficiencies.

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