Fig. 11.
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K − W3 vs. BP amplitude diagram for stars that have EW(TiO) > 10 nm. The BP amplitude is defined by Eq. (2). The red dots in both panels are selected late-type RSG candidates, while the gray dots are stars considered to be AGB stars. The blue and green dots in the right panel are the oxygen-rich AGB (OAGB) and carbon-rich AGB (CAGB) stars identified by Suh (2021), respectively.
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