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Table 1

Characteristics of the instrumental setup used for the measurements.

Ti–Al film

Valid pixels [#] 18
Pixel size [mm] 2.3
Film thickness [nm] 10–25
Polarised sensitive detectors yes
Angular size () 0.75
Overall optical efficiency [%] 30
Total background [pW] 0.4

Notes. The total background is calculated per pixel using a realistic optical simulation.

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