Primary-beam corrected, constant column density H I contours overlaid on a r-band image from the Fornax Deep Survey (Iodice et al. 2017). The contour levels are 2.7 × 10¹⁹ × 2ⁿ cm⁻² (n = 0, 1, 2, ...). The lowest contour corresponds to a 3σ signal in a single channel at the centre of the H I cube (coincident with NGC 1316) but has lower significance further out. The 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 20 kpc (∼3.5′ at a distance of 20 Mpc). The H I properties of the labelled sources are listed in Table 2.