RMS contrast of granulation images recorded in different seeing conditions characterized by the calculated Strehl value based on the residual wavefront RMS from r₀ and assuming that the AO system provides perfect correction of 81 modes. The blue dots refer to RMS contrasts of images that are compensated only for the diffraction limited PSF, and correspond to the blue dots in Fig. 6. The green dots correspond to the same contrast measurements but with the Strehl value calculated on the basis of an additional wavefront variance corresponding to 1/13 wave RMS at 630 nm, and scaled at other wavelengths as the inverse of the wavelength. The straight lines have been fitted to data points for which the Strehl is larger than 0.15.