Notes. ⁽¹⁾ The central coordinates and systemic velocity are those of the dynamical centre (Sect. 3.2). Throughout this paper we list barycentric velocities in the optical convention v = c × (ν₀/ν − 1), where c is the speed of light, ν₀ the rest frequency, and ν the observed frequency in the barycentric frame of reference. ⁽²⁾ This is the distance of the Fornax cluster as a whole. ⁽³⁾ The value reported here for the H I mass is measured from the image at 66″ resolution, while at higher resolution it is slightly lower. The uncertainty is calculated by adding in quadrature the statistical uncertainty within the H I detection mask (which depends on the noise level in the cube and the number of independent voxels in the mask) and a 10% flux scale uncertainty (Serra et al. 2023). The latter term dominates the error budget.