Continuum-subtracted iSHELL spectrum of DR Tau with a model based on the best-fitting parameters obtained through the rotational diagram analysis. The gaps visible (highlighted by the black arrows in the top panel) in the iSHELL spectrum correspond to removed telluric features. The top panel shows the full model, whereas the bottom panel shows the contribution of each band separately. For ¹²CO, the narrow and broad component are shown together. In addition, in the bottom panel we highlight the ¹²CO transitions which have an upper level J-value of 10, 20, 30, or 40.