Channel maps from the untapered VLA-B configuration datacube. Each channel is shown with a linear stretch from 0 to 6σ, where σ = 2.5 × 10⁻⁴ Jy beam⁻¹ is determined from fitting the negative distribution of pixels in each channel. Contours are drawn at 2σ (dashed), 4σ, and 6σ. The bottom right panel shows the same viewport (46″/12.7 kpc along each axis), but with the Hα NB image and the total N_HI contours from Fig. 1.