Ellipse defined by the fitted exponential at the scale length h in the image plane (dashed black) and the transformation into the image plane (dark blue). These ellipses are plotted over the MUSE image of the Lyα halo of A2744-45924 after applying a smoothing Gaussian filter of σ = 1 px. Also show are the directions of the radial and transverse magnification μ_r and μ_t (yellow and cyan arrows, respectively). The length of the arrows is proportional to μ_r − 1 and μ_t − 1 (μ_t = 1.68, μ_r = 1.07). the magnification in each direction.