Top: phase lags in J band for FO Cepheids based on the epoch of the maximum (black circles) and on the epoch of the mean magnitude along the rising branch (orange dots). The median (solid lines) and rms (dashed lines) of the ten calibrating Cepheids are overplotted. The black labels refer to the epoch of maximum, orange labels to the epoch of the mean magnitude. Bottom: the amplitude ratio A(J) /A(V) for FO Cepheids. The mean values for the two adopted bins in period (P ≤ 2.8, and P> 2.8 days) are also labeled (black solid lines).
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