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Fig. 4

image

Merged light-curves (Tbin) for the J (left), H (middle) and KS bands (right) for the ten period bins of FU Cepheids (see Eq. (5) and the following text for more details). The range of periods in days is labeled in the top right corner of the left panel for each bin. The G3 (green line) and the F7 (red line) templates are also shown.

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