Example phase screens (top) and amplitude maps (bottom) in the image plane induced by low-order Zernike aberrations in the pupil plane at a wavelength of λ₀ = 2.2 μm. From left to right: the considered aberrations are a perfect Airy pattern, a vertical tilt of 0.4 μm RMS, a vertical astigmatism of 0.2 μm RMS, a vertical coma of 0.2 μm RMS, and a combination of astigmatism, coma, and trefoil (with RMS 0.2 μm, 0.2 μm, and 0.1 μm, respectively). The rightmost panel also considers an additional fiber tilt with 0.2 μm RMS.