R-head region of the 0-0 band of ⁵²CrH A-X, at arbitrary scale. Shown in red is our fit, N′ < 15. In blue is the calculated absorption cross-sections from the ExoMol software (Tennyson et al. 2020) based on the data from Burrows et al. (2002); the full intensity scale for the strongest line shown is 8 × 10⁻¹⁵ cm² molecule⁻¹. A laboratory spectrum is shown in black. Dashed green lines indicate significant improvements in our model.