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Fig. 3.
Left panels: P–L diagrams in the LMC for the FU and FO Cepheids. Right panels: combined FU and FO Cepheids after converting the period of FO Cepheids to corresponding periods of FU Cepheids. Upper panels: V filter. Lower panels: I filter. Blue and red points are for FU and FO Cepheids, respectively.
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