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Fig. 2.

image

Schematic overview of the telescope and SPHERE/IRDIS, showing the optical components that are relevant for the polarimetric imaging mode. The curved arrows indicate components that rotate during an observation block. Reflections at angles of incidence ≥45° in the instrument are represented with similarly large incidence reflections in the figure. The green beam shows the starlight before color filters are applied, blue represents visible light, and red and orange represent NIR light (the orange beam toward the IFS shows the shorter wavelengths).

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