Fig. 1
Observing conditions and evolution of spectral resolution. From top to bottom: temporal evolution of the airmass, seeing, spectral flux measured on a blue chip, and instrumental resolution. Red crosses represent single data points. The shaded area indicates the transit duration and the transit mid-time, T0, refers to MJDHJD,UTC = 56 109.26164. This value is used in all the following figures.
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