Illustration of masking for two E(B − V) thresholds across our sample, overlaid on the V maps. Each row corresponds to a galaxy, ordered from top to bottom by decreasing star formation rate. The left column shows masks where Voronoi bins with E(B − V) > 0.7 are excluded (greyed out), while the right column shows masks for E(B − V) > 0.2. Galaxies are also labelled with their star formation rates in M_⊙ yr⁻¹. We show the range in the velocity colour bar in the bottom right of the right-side panels. Aggressive masking removes most mid-plane bins in highly star-forming galaxies.