Non-primary-beam-corrected total intensity H I map of Leo T. Contours are at [−3, 3, 5, 10, 20, 40, 60, 80]-σ; the lowest contour level is approximately 1.6 × 10¹⁹ atoms cm⁻². The mask used to define the Leo T source extent for cleaning is shown in gray. The light-blue circle is the optical center, the green x is the center of the H I ellipse, the yellow cross is the center of the H I distribution, the pink triangle is the peak of the H I distribution, and the large green circle is the H I extent at the 2.7 × 10¹⁹ atoms cm⁻² level (Sect. 3.4).