Relation between the H I tail T_S and the optical tidal feature L5. The image shows a single H I contour at a column density of 2.7 × 10¹⁹ cm⁻² (black) overlaid on a stack of the g-, r- and i-band images from the Fornax Deep Survey (Iodice et al. 2017) shown in false colour with a linear stretch. The optical image was convolved with a 4″ Gaussian (FWHM). The black circles indicate bright foreground stars. The H I Gaussian restoring PSF in the bottom-left corner has a FWHM of 36.7″ × 28.1″ and position angle 109 deg. The scale bar in the top-left corner represents 10 kpc (∼100″ at a distance of 20 Mpc).