Fig. 1.
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HST images of the Necklace. The field of view of each panel is 25 × 25 arcsec2. North is up and east is left. The colour-composite image (upper left) comprises red ([N II]), green (Hα), and blue ([O III]). In the [O III] image, the position and size of the circular COS aperture is shown in red, while the inner nebula region from C11 is shown in blue.
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