The ZrO and TiO indices for the naked stellar atmospheres in the sample. Squares and circles indicate stars with and without significant SiS absorption with a colorscale that indicates the C/O ratio. Stars for which we have no estimates for Teff, C/O, and [s/Fe] are indicated with open symbols. The figure shows a one-one relation between C/O ratio and presence of SiS absorption in the infrared spectrum.
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