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Fig. 2

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Log of observations. Airmass (upper), seeing (middle), and signal-to-noise ratio in order 56 (bottom) during the time series. The vertical dashed blue lines indicate the start and the end of the transit. The first exposure has a shorter exposure time of 555 s. The grey horizontal line indicates the 2.2 airmass calibration limit of the ADC, based on which the three last exposures were rejected.

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