Observation conditions for each studied transit: signal-to-noise ratio (S/N) evolution with respect to time from mid-transit is shown in the solid black curve. The S/N provided by SPIRou is measured in the H band (1.65 μm). The blue dashed curve shows the airmass evolution along time from mid-transit. The vertical gray lines indicate the four contact points: the dashed ones correspond to T1 (start of transit) and T4 (end of transit), and the dash-dotted ones to T2 (end of ingress) and T3 (beginning of egress).