Top: enhanced DECaLS gr image of the core group with LSB features highlighted. The black regions around the galaxies are due to over-subtraction of the sky that occurs in the DECaLS pipeline. The grey regions are the masked high-surface-brightness emission. Bottom: as above but for the area surrounding NGC 848. This image also includes H I contours from the combination of the three channels where the NGC 848S tail is most pronounced. Levels: −1, 1, 2, 3, 4, 5 × 0.05 Jy km s⁻¹ per beam, ×4.9 × 10¹⁹ cm⁻², or ×0.39 M_⊙ pc⁻².