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Fig. E.1


Inputs for Model 1. Shown in the panels are the H2 gas density (top left), infall velocity (negative represents expansion; top right), 28SiO abundance (middle left), H2O abundance (middle right), and the kinetic temperature (in black) and excitation temperatures (in colours) of the three 28SiO transitions (bottom left) and the H2O transition (bottom right). In the bottom 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 2.2 × 1014 cm. Small negative values for the excitation temperature would give strong maser emission. Vertical dotted lines indicate the radii at which the spectra were extracted; coloured horizontal dotted lines in the bottom 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, where the input values for H2 gas density and molecular abundances are above the range of the plots.

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