Spectra of unblended lines of TiO₂ with the the highest S/N, and two blended lines (blue). The velocity scales of the blended lines refer to the average rest frequency of the two components. Parts of the spectra that contain strong emission from other species were blanked for clarity. The lines found in the PdBI observations are shown in the top three panels on the left. The dotted (green) vertical lines mark the position of the three main components of the TiO₂ emission identified in the combined profile (cf. Fig. 2). The ordinate is flux density in Jy and corresponds to the aperture of 1′′  ×  1′′ in the SMA spectra or to the full beam size (49  ×  22) in the PdBI data. The SMA spectra were Hanning smoothed.