Fig. 15
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K and λmax plane. The figure containing our eight unvariable standard stars compared to the sample from Bagnulo et al. (2017); Cikota et al. (2018, 2017); Nikolov (2022); Zelaya et al. (2017); Nikolov & Kaltcheva (2023). The empirical K-λmax relation determined by Whittet et al. (1992) is presented with a black line and the dashed black lines trace the 1σ uncertainty.
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