C II doublet in Visit A_fuv. Upper panel:Coaddition of the λ1334.5 and λ1335.7 lines in velocity space. The comparison of the pre-transit mean spectrum (black) with the averaged in- and post-transit spectra (blue) reveals a flux decrease in the doublet core and a flux increase in its wings. Lower panel: Flux integrated over the absorbed velocity range –29 to 27 km s⁻¹ (filled squares) and over the complementary range within –100 to 100 km s⁻¹ (empty squares). Fluxes are normalized by the pre-transit values and plotted as a function of time relative to 55 Cnc e transit.