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Fig. 1.


Ursa Major (UMa) arc, feature A (between the red arrows), in a mosaicked image of GALEX FUV data taken in 2005. Each (circular) pointing has a diameter of . Inset (a) shows the original 1997 detection of the Hα filament published by McCullough & Benjamin (2001); inset (b) shows part of the arc in GALEX NUV data; inset (c) shows a section of the arc that was observed in Hα as part of the MDW Hydrogen-Alpha Sky Survey in 2016 (Mittelman et al. 2019). The bright NUV feature below A.2 is an artifact in the GALEX data. Intensity scaling in all diagrams is arbitrary. In general, brighter colors correspond to more intense regions in the FUV and NUV maps, while darker colors correspond to more intense Hα. The three sections of this feature are labeled as A.1–A.3 interrupted by gaps in the GALEX coverage. The two additional insets in the FUV maps along A.3 have an adapted color scale to optimize the visualization of the arcs.

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