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Fig. 3
HST images of the main nebula. First row: [O iii](λ5007 Å) and H α after subtracting [NII] contribution (see text); second row: [N ii] (λ6584 Å) and [S ii](λ6716 Å+λ6732 Å). The images are in the same orientation as shown in Fig. 1 and cover the field of view shown there. The similarities in the structures are obvious.
This figure is made of several images, please see below:
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