Fig. A.1.

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First step of data coalignment. Panel (a): HRIEUV image taken on 23 February 2021 at 17:20:59 UT with intensity isocontours of 1500 (blue) and 2000 (orange) DN/s. Panel (b): Corresponding (reprojecting the SPICE data over the HRIEUV field of view by using the WCS keywords in the file headers) intensity map of Ne VIII line radiance from the SPICE context raster starting at 17:33:43 UT with the same HRIEUV contours of 2000 DN/s as in panel (a). Panel (c): Same as panel (b), but the intensity map is manually coarse-aligned to the HRIEUV intensity.

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