Fig. 1
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Period-luminosity relations (PLRs) in the reddening-free WJK index, formed by the three types of LPVs: OSARGs, SRVs, and Miras as classified by Soszyński et al. (2007). Miras, for which a period with a significantly high S/N in the pre-whitened light curve was detected, are marked in red, with the strongest period detected after pre-whitening.
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