Spectra of Mira covering the part of the γ′ system of TiO that occasionally displays emission features. The date and corresponding visual phase and magnitude are indicated in the top right corner of each panel. The spectra are shown in the chronological order. Branches forming main electronic features are indicated in black and red for the (0,0) and (1,1) bands, respectively. The wavelength scale in Å is in the heliocentric rest frame.