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Fig. 4

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Effects of the SiO-H2O line overlap on the excitation of the SiO maser emission for the three first vibrationally excited levels, v = 1, v = 2, v = 3 (blue, green and red respectively) J = 1–0 (solid lines) and J = 2–1 (dashed lines). The number of emitted photons (s-1 cm-3) in the maser transitions as a function of H2 density is shown. Left panel: model calculations that do not include the effects of the line overlap. Right panel: model results including the line overlap.

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