Overall data quality for SHINE and snapSHINE. (a) Histogram of the star magnitudes (G, H, K) for the sample considered in this study. (b) Scatter plot showing the coherence time (τ₀) against the seeing with the Strehl ratio color-coded. Data points without SPARTA Strehl information are colored in white. The grey box delimits the ESO 50% best observing conditions (seeing <1 as and τ₀ > 3.2 ms) whereas the yellow box delimits the 30% best (seeing <0.8 as and τ₀ > 4.2 ms). (c) Scatter plot showing the 1σ raw contrast at 0.5 arcsec (directly measured on the coronagraphic frame, before post-processing) with respect to the H-band (main IRDIS band used in SHINE) star apparent magnitude. The best contrast performances are achieved for the brightest stars with a high Strehl ratio. (d) Scatter plot displaying the Strehl ratio as a function of the star’s apparent magnitude in the G band (AO spectral channel). As expected, the performances of the AO system deteriorate for fainter stars.