Input temperature for Model 2. The panels show the kinetic temperature (in black) and excitation temperatures (in colours) of the three 28SiO transitions (left) and the H2O transition (right). In the right panel, the solid red line indicates positive excitation temperature (i.e. non-maser emission) of the H2O transition, and the dashed red line indicates the absolute values of the negative excitation temperature (i.e. population inversion) between 1.7 × 1014 and 2.4 × 1014 cm. Small negative values for the excitation temperature would give strong maser emission. Vertical dotted lines mark the radii at which the spectra were extracted; coloured horizontal dotted lines in both panels indicates the upper-state energy (Eup/k) of the respective transitions. The innermost layer within Rcontinuum represents the grid cells for the pseudo-continuum.
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