Channel maps showing the H I emission in the SE tail and NGC 848 overlaid on the DECaLS r-band image. Contour levels: −1, 1, 2, 4, 8, 16 × 0.9 mJy per beam, ×1.8 × 10¹⁹ cm⁻², or ×0.15 M_⊙ pc⁻². The contours are coloured (in order of increasing flux): black (dashed), black, blue, purple, red, and orange. The noise level rises towards the South East as this it is near the edge of the VLA primary beam.