Logarithmic scaled Hα emission line map of ESO 338 showing the spatial extend of the ionized halo. A Voronoi binning with minimum S/N of 5 and maximum bin size of 900 pixels (∼6□″) was applied. The Voronoi cells which have lower S/N than 5 are removed and plotted as black. Plotted in black contours are the contours of the I-band image reconstructed from the MUSE cube. Contour levels are 15, 50, 100, 400, 700 and 1000 × 10⁻²⁰ erg s cm⁻² Å⁻¹. The lowest contour corresponds to an AB I-band magnitude of 25.2 mag. The saturated parts of the Hα image in the centre as well as the two bright foreground stars are masked out and appear as black.