Fig. 4.

Upper panels: examples of time variation of the light curve peak-to-peak amplitude, from stable pattern at the age of Upper Scorpius to much less stable pattern at the Pleiades age in the 3.0 ≤ (V−Ks)0 ≤ 4.0 mag color range. Bottom panels: light curve stability remains mostly unchanged at the Upper Scorpius and Pleiades ages in the 4.0 ≤ (V−Ks)0 ≤ 5.0 mag color range.
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