Line profiles of TiO isotopologues observed with ALMA (cf. Table 2). One line of ⁵⁰TiO observed in June 2014 is not shown because is covered by one resolution element only. The flux densities were scaled by their relative solar isotopic ratios, as indicated in the right legend. The arrows indicate the center-of-mass velocity of Mira. Spectra were extracted from regions encompassing the entire emission region.