Comparison of the observed (black dots) and synthetic spectra for the M4.0 III star HD 145206 in the spectral region around λλ7800 Å (top panel) and λλ7100 Å (bottom panel). In both panels the continuous black line is a synthetic spectrum with no Rb or Zr, while red dashed and dotted lines show theoretical spectra with log ϵ(Rb) = 2.35 and 2.6 (top panel), or log ϵ(Zr) = 2.7 and 3.0 (bottom panel), respectively. Some metallic lines are marked and labelled. In the λλ7100 Å region the pseudo-continuum is reduced mainly due to the contribution of a TiO veil.