Analysis of the transitions of Ca I at 6162.27 Å, Ca I at 6493.8 Å. and Sc II at 5526.79 Å are shown in the first, second, and third row, respectively. Left panels: absorption excess in the binned transmission spectrum. For reference, the normalised stellar spectrum and the telluric spectrum (0.1 offset and 3 times magnified) are shown at the top of each panel. The shaded zones represent the pass-bands sizes. Middle panels: light curves derived from spectrophotometry using the ×4.5 band for both Ca I transitions and for Sc II. Flat light curves represent the averages of in-transit and out-of-transit data. Right panels: derived bootstrap distributions showing the detection stability: blue represents the in-in distribution, red the out-out distribution, and green is the in-out distribution.