False color image of M 83 and its XUV disk. Blue corresponds to FUV from GALEX, green to NUV from GALEX, and red to Hα emission from this work. The Hα image has been background-subtracted (see Sect. 2.5), and due to that, much of the diffuse Hα light in the central regions of the galaxy has been removed. The contours show H I column densities going from 5 × 10¹⁹ cm⁻² (white contour) up to 4 × 10²⁰ cm⁻² (darkest contour) in 5 × 10¹⁹ cm⁻² intervals. The contour levels were chosen to highlight the outer parts of the H I disk without covering the FUV-bright and Hα-bright parts of the XUV disk. The H I data is from the Local Volume H I survey (LVHIS; Koribalski et al. 2018). The image is 1 ° ×1° in size.