Some examples of visibility spectra for given baselines. The complete sample can be found in Appendix A. Molecular and dust features are highlighted for stars with different chemistry: R Leo and R Crt are M-type stars, π¹ Gru is an S-type object, while R Lep and TX Psc are C-type stars. The lower right panel shows an example of the visibility spectra of the carbon star U Ant (cf. Sect. 4.1). The typical error bars are of the order of 10%.