Left panel: central part of the ɡ-band LBT image of NGC 5238, covering a field of view of ~ 4.9′ × 7.5′, or ~ 6.0 × 9.2 kpc² (using the distance in Table 1). The peculiar structures with low surface brightness are highlighted by the blue polygons. Middle panel: map of RGB stars in the same area, background-subtracted and with pixels below 3σ of the background set to zero. The HI iso-density contours are superimposed in black and correspond to a column density of [2.5, 5, 10, ad 20] ×10²⁰ atoms/cm². The horizontal black bar is 1 kpc long, adopting the distances in Table 1. Right panel: HI velocity field. The beam size is also shown in the bottom right corner. North is up, and east is to the left. The HI data are from the VLA program 23A-195 (Cannon, Schisgal et al., in prep.). All three panels are exactly on the same scale.