Field around NGC 1313 X–1 in optical and X-rays. The left panel shows the HST continuum-subtracted WFC3/UVIS/F657N (Hα + [N II]) image. The WFC3/UVIS/F547M image was used for the continuum approximation and the position of NGC 1313 X–1 is indicated by a green circle. The red ellipse shows the 3σ contour confidence level of the easternmost source with red-ish colours in the Chandra image. The same regions from Fig. 6 are also shown, and the insets show close-ups of the two SNRs, as indicated. The right panel shows a R,G,B = 0.5–1.2 keV, 1.2–2 keV, 2–7 keV Chandra image showing the same field. Both images show a of 32″ × 32″ field centred around the ULX and have been smoothed with 2 pixel Gaussian kernel.