Surface brightness of the H₂ 1–0 S(1) continuum-subtracted image for NGC 6751. The upper left panel displays the entire nebula, revealing faint emission from its halo at distances greater than 30 arcsec. The right panel a provides a zoomed-in view of the nebula’s center, showing the eastern and western jet-like structures along with numerous knots in the outer rim. The bottom panels present the continuum-subtracted H₂ image overlaid with HST [N II] emission line contours: panel c focuses on the nebula’s center, while panels b and d display the pairs of jet-like structures. The apparently bright knot in the western jet-like structure is a background star.