Trot of optically thin H2O emission (top), optically thick H2O emission (N = 1017 cm-2; middle) and optically thin CO emission (bottom) determined from RADEX simulations. Trot is calculated from the same transitions as in Sect. 2, i.e., excluding the ground-state transitions. The gray area indicates the observed values of Trot. The points indicate the different physical conditions examined; model 1 (red) has (T, n) = (150 K, 106 cm-3) for the EHV components and (100 K, 106 cm-3) for the broad component. Model 2 (blue) has (T, n) = (500 K, 105 cm-3) for the EHV components, respectively. Model 3 (green) has (T, n) = (500 K, 106 cm-3) for all components.
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