The colour index J − K vs. the bolometric correction for the O-rich stars of our sample that required two black-bodies when fitting their SED. The sample is separated into three groups according to the luminosity ratio of the two black-bodies: L-ratio < 0.013 (filled circles), 0.013 ≤ L-ratio < 0.025 (open circles), and L-ratio ≤ 0.025 (crosses).
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