Same as Fig. 1 but for the regions around Rb I λ7800 Å (top panel) and Rb I λ7947 Å (bottom panel) for the M1.5 V star J22565+165 (HD 216899). Red solid, and dotted curves show theoretical spectra computed with log ɛ(Rb) = 2.8, 2.55 (best fit), and no Rb, respectively. Some Ti I, Ni I, and Fe I lines are marked and labelled. In these regions, the pseudo-continuum is reduced mainly due to the contribution of TiO.