Comparison between the (left) MUSE equivalent HST/ACS/F555W bandwidth and (right) HST images of the field around NGC 1313 X–1, after astrometric correction of the MUSE cube. The white circle in both images is 0.61″ in radius and shows the 3σ uncertainty on the position of the ULX NGC 1313 X–1 in the MUSE cube. The position of the optical counterpart of NGC 1313 X–1 determined by Yang et al. (2011) can be seen on the HST image. The red circles indicate a bright star of a young cluster of massive stars (Ryon et al. 2017) to aid the comparison between the images. The contours show the flux of the [O I]λ6300 line (see Fig. 5). Both images have the same orientation and show a region of 30″ × 30″.