Density probability of the multimode instantaneous Strehl ratio (I =  |T₁₂| ², red lines) and singlemode one (I =  |ρ₁₂| ², black lines) for various levels of AO correction and turbulence strengths. Top: constant turbulence strength D/r0 = 8 and the number of corrected Zernike are, from left to right, n_z = 10,15,30. Bottom: constant AO correction n_z = 3 (tip-tilt only), with various turbulence strengths, from left to right D/r₀ = 8,4,2.