Fig. A.1
Colour-composite image of the Hα (red), [OI] (green), and [OIII] (blue) emission from channel 15. The star-forming clump can be seen to the south-west end of the filament as a red region, which indicates that it is dominated by Hα emission. The other clumps appear blue because they are very bright in [OIII] emission. Finally, the arcs appear green because they are stronger in [OI] relative to the other emission lines than the clumps.
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