Fig. 4.
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Flux-density profiles for the south-western clump and the extended arc in red and blue, respectively. The top panel shows the radial Hβ flux-density profiles for both structures. The upper middle panel shows the radial [O III]λ5007 flux-density profile for both structures. The bottom middle panel shows the Hβ and [O III]λ5007 flux-density profile in purple and green, respectively, for the complete nebula integrated over the entire angular range. The bottom panel shows the Hβ/[O III]λ5007 ratio in black for the complete nebula integrated over the entire angular range.
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