MATISSE and MIDI normalized continuum-subtracted correlated spectra per baseline. From top-left and clockwise the spectra are plotted from the longest baseline to the shortest, while an offset has been applied for clarity. The MATISSE 2019 data are drawn in darker shades of color compared to the respective 2020 data, which are shown in lighter shades. The MIDI data are shown as black and gray lines. The uncertainties of the normalized correlated fluxes are shown for comparison as shaded regions.