UV spectra reproduced from Lecavelier des Etangs et al. (2004, their Fig. 1). Observation taken with FUSE, with an aperture (30″ × 20″) covering the whole galaxy. Top: Position of the observation; picture is taken from the MAST archives with background image from Pan-STARRS. Bottom: Spectra presented in Lecavelier des Etangs et al. (2004). Since the full galaxy is in the aperture, the features of the localized stellar populations are not expected to be seen (see Fig. 10, as well as our discussion in Sect. 4.2).