CO v = 1 − 0 (upper panel) and H₂O ν₂ = 1 − 0 (middle and lower) bands in VV 114 SW-s2. Color-filled black histograms show the data, and the red lines show the total absorption predicted by our composite model. The inserts in the upper panel show the spectra of the CO 3–2 line observed with ALMA and several CO v = 1 − 0 lines with the abscissae in units of velocity; the contributions of each of the three components (blue: hot; green: warm; gray: cold) are also shown. The labels for the H₂O transitions, where the ′ corresponds to the upper vibrational state, are indicated as for readability. Note that all spectral features are blueshifted relative to the labels, because we use CO (3–2) as the velocity reference (z = 0.02013).