Examples of the calibrated flux (averaged for four ATs), the squared visibility amplitude |V|² (averaged for both polarizations), and the closure phase as a function of the wavelength for both our targets at representative dates. The flux was calibrated using the spectral transfer function of the calibrators. The |V|² dataset consists of six projected baselines B, while the closure phase consists of four baseline triplets, labeled using the longest baseline in the triplet B_max. Spectral regions analyzed in this work are highlighted. Upper three panels: R Car. Lower three panels: VX Sgr.