Rotational diagram for TiO. Red, blue, and green points represent detected lines and the magenta triangles indicate 5σ upper limits. The linear fit that constrains the excitation temperature and column density of the main isotopologue, ⁴⁸TiO is shown with the dashed line and the shaded area corresponds to 1σ uncertainty of the fit. Gray points and an arrow (lower left) correspond to measurements of ⁴⁶TiO and ⁵⁰TiO and to an upper limit for ⁴⁷TiO. The two 2015 measurements for ⁴⁶TiO and ⁵⁰TiO, scaled by reciprocal of their solar abundances, are shown with cyan diamonds. They were included in the final fit.