Subsets of the observed spectra of MonR2 IRS3 with the best-fit local thermodynamic equilibrium (LTE) model plotted in red; telluric transmission is plotted in blue. Data are plotted in the rest frame of MonR2 IRS3 (V_LSR = 10 km s⁻¹). For the best-fit parameters and their definitions, see Section 3.1. We use the upper limit Doppler parameter (3.20 km s⁻¹) in generating the plotted model. Gaps in the data represent regions where the telluric transmission drops below 80%. Blue stars denote absorption features due H₂O in the target.