ℒ₀ effect on the OTF for typical r₀ values (left plots). The ratio between the Von Kàrmàn and Kolmogorov OTF models is used as an illustration. The effect is more significant in the low frequency range (below 0.2 cycles per arcsecond) for small r₀ and ℒ₀ values. The right plots display an experimental OTF fitted with the two models (left) and the corresponding PSFs (right). Frequencies below 0.2 cycles per arcsecond are considered for the fits since there is more noise at higher frequencies.