Radial extent of H I and CO in NGC 1512. This galaxy has the largest H I disk in our sample. The maximum galactocentric radius of the CO(2–1) observations is sensitive to the ALMA field-of-view (we recover ∼70 − 90% of the total CO emission, see Section 2.3). The scatter points show each individual sight line, i.e. 1.5 kpc aperture. The red-to-yellow color scale shows the point density of Σ_HI and the dark-blue to yellow shows the point density of Σ_H2. The white and red lines show the median within a given 1.5 kpc wide radial bin. We see that H I extends until r_gal ∼ 120 kpc (that is 5 × r₂₅ or 8 times the optical radius of the Milky Way, indicated as a purple arrow). We indicate the approximate r_gal range where NGC 1510 sits with vertical dashed lines. The clumps NGC 1512-south-a, NGC 1512-south-b, and NGC 1512-west are ∼140 kpc from the center of NGC 1512. We indicate R_eff, r₂₅ and R_HI as gray, pink, and orange vertical dashed lines, respectively (taken from Table 1).