Gaia BP/RP spectra of three stars per chemical spectral type used to construct the discriminatory model. First row: M(NB)- and M(B)- type; second row: S-type; third row: C-type. Solid and dashed arrows mark peaks and minima, respectively, of characteristic molecular bands: TiO (black); LaO, VO, or ZrO (red), and CN (blue). The solid green arrow shows the peak of the TiO absorption bands at 749.8 nm.