IZw1 (top) and F14348−1447 (bottom) MUSE images. Left column: colour-composite optical image, showing [O III] (green), Hα (red), and continuum emission (blue). Second column: Hα map obtained by collapsing the MUSE data cube on the emission line after subtracting the continuum using adjacent regions at shorter and longer wavelengths. Third column: red continuum (∼ 8500 Å) image from MUSE, with contours from HST/F160W. Right column: continuum colour map obtained from MUSE by dividing the red continuum image (∼ 8500 Å) by the blue image (∼ 4500 Å); contours from HST/F160W. See Appendix C for further details. The crosses in the panels show the detected satellites in the MUSE FOV.