Phased diagram of the variability of the UV excess monitored over a baseline varying from a few hours to a few rotational cycles for an NGC 2264 accreting member (M_∗ = 1.13 M_⊙; Ṁ_acc = 5.98 × 10^-9 M_⊙/yr; P_rot = 4.767 days, from Affer et al. 2013). The phase is computed starting from the epoch of the first measurement; the UV excess at each epoch is computed as described in Eq. (9). Different symbols correspond to different rotational cycles.