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Fig. 3

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Spectra of the three knots and the arc-like feature, as well as of a representative point in the nebula located roughly half way between knot C and the arc, showing the enhanced [NII] and [SII] emission with respect to Hα in the knots and the arc as compared to the surrounding nebula. The weak [OI] emission line in the spectrum of nebula is almost entirely of telluric origin

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