Comparison of FWHM (top) and β parameter (bottom) for measured data on MUSE images (extract from Globular Custer data) and PSFR data (computed from atmospheric data obtained using AO telemetry) convolved by a 0.2″ FWHM Gaussian function (to account for MUSE pixel size). The various colors stand for various seeing values domain (black: 0.2–0.4″ – red: 0.4–0.6″ – orange: 0.6–0.8″ – green: 0.8–1.0″ – blue: 1.0–1.5″