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Fig. 2

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Chromatic drift of the Espresso Fabry-Pérot for five representative wavelengths. The curves in the top panel show averages of the measurements displayed in the central panel of Fig. 1 obtained in ±4% wide spectral ranges around the stated wavelengths. Linear slopes were fitted to the data to provide a coarse estimate of the chromatic drift rates. The bottom panel shows essentially the same data, however, without subtracting the achromatic drift. Linear slopes were only fitted to epochs before the shutdown.

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