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Fig. 8

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Comparison of the synthetic spectra based on the MARCS models with the observed VISIR spectra of seven K–M giants. The observed and synthetic spectra are shown by the black and red solid lines, respectively. The relatively isolated 28SiO, 29SiO, and 30SiO lines are marked by the black, red, and green arrows, respectively. See Fig. 1 for their identification. The 28SiO lines with absorption excess are marked by the blue dots.

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