Lyα spatial morphology and 1D spectrum. Top: MUSE pseudo-narrowband of the Lyα emission (left), core+halo model (center), and residuals of the fit (right). The morphology of the Lyα halo is fitted to a two-component model composed of a 2D Gaussian and exponential. The scale length of the exponential component (halo) is h = 5.7 ± 0.7 pkpc, correcting for magnification. Bottom: optimally extracted 1D spectrum of Lyα. We show the fitted skewed Gaussian model (red line). The Lyα line shows a narrow single-peaked profile, typical of star-forming galaxies. The bottom axis shows velocities with respect to the systemic redshift of the Hα emission.