Contribution to the synthetic transmission spectra for all considered absorbing species. Dashed lines are computed from abundances obtained with V20, and solid lines from abundances obtained with V23. The plotted quantity is the relative difference to the total transit depth, , with D_tot being the total transit depth and D_spec being the contribution of the species to the total transit depth. For each wavelength, only the uppermost and close lines have significant impact on the spectrum.