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Accurate, experimental rovibronic energy levels, with associated labels anduncertainties, are reported for 11 low-lying electronic states of the diatomic\TiO\ molecule, determined using the \Marvel\ (Measured ActiveRotational-Vibrational Energy Levels) algorithm. All levels are based on linescorresponding to critically reviewed and validated high-resolution experimentalspectra taken from 24 literature sources. The transition data are in the 2 $-$22,160 \cm{} region. Out of the 49,679 measured transitions, 43,885 aretriplet-triplet, 5710 are singlet-singlet and 84 are triplet-singlettransitions. A careful analysis of the resulting experimental spectroscopicnetwork (SN) allows 48,590 transitions to be validated. The transitionsdetermine 93 vibrational band origins of \TiO\, including 71 triplet and 22singlet ones. There are 276 (73) triplet-triplet (singlet-singlet) band-headsderived from \Marvel\ experimental energies, 123 (38) of which have never beenassigned in low or high resolution experiments. The highest $J$ value, where$J$ stands for the total angular momentum, for which an energy level isvalidated is 163. The number of experimentally-derived triplet and singlet\TiO\ rovibrational energy levels is 8682 and 1882, respectively. The lists ofvalidated lines and levels for \TiO\ are deposited in the SupportingInformation to this paper.

MARVEL analysis of the measured high-resolution rovibronic spectra of $^{48}$Ti$^{16}$O