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Fig. A.1.


Left panel: FUV (blue) and NUV (red) intensities, averaged over the whole length of A.2 (see Fig. 3), vs. position across the width in arcmin. We show the average profiles, labeled ⟨FUV⟩ and ⟨NUV⟩, and their corresponding errors. The ⟨FUV⟩ is scaled up for visualization purposes; the best-fit profile is shown in green (see main text and right panel). Two vertical dashed lines delimit the borders of the A.2 filament merging with the local background/foreground UV emission. Right panel: scatter plot and linear correlation between ⟨FUV⟩ and ⟨NUV⟩. The linear fit was computed only considering the data points (see orange circles) within the vertical dashed lines in the left panel. The intensity profile obtained scaling the ⟨NUV⟩ with the best-fit parameters of the linear fit is shown in green on the left.

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