All TiO₂ transitions covered by the ALMA 2015 data. The black histograms present the observations and the red line shows a simulation based on the best-fit excitation model of TiO₂ found with CASSIS. Each panel is centered on the transition labeled in the upper left corner and the central velocity is indicated with a vertical dashed line. When another line of TiO₂ is covered by the plot, its simulation is also shown. The highlighted parts of the TiO₂ profiles were used in our minimization routine. Many of the lines shown are contaminated by emission of other species, the strongest of which are labeled in green. Lines with E_u higher than about 300 K were not detected and their spectra are shown for completeness.