Fig. 4
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Surface brightness of the H2 1–0 S(1) continuum-subtracted image for NGC 6818 is shown in the left panel. The other panels present the H2 continuum-subtracted image overlaid with HST [N II] emission contours, highlighting three regions of the nebula: panels a and b correspond to the “mustache” structures, while panel c shows the brighter southern part of the nebula.
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