Distribution of the observational conditions (when available) for all the epochs: Strehl ratio, atmospheric coherence length r₀, wind, seeing, and atmospheric coherence time τ₀. The Strehl ratio, atmospheric coherence length, and wind were all measured by SPARTA, the computer of the adaptive system of SPHERE, while both the seeing and atmospheric coherence time were measured by the DIMM telescope at Paranal. A wind ≤ 3 m · s⁻¹ indicates the presence of low wind effect (Milli et al. 2017), while a coherence time ≤ 3 ms indicates the presence of wind-driven halo (Cantalloube et al. 2020).