Comparison of line radiance histograms of four representative lines (Mg ix 368 Å, He i 584 Å, Mg x 625 Å, and O v 630 Å) from spectra in the USUN and SYNOP mosaics, as shown in Fig. 1: USUN on-disk data (grey), USUN on-disk data within the SYNOP FOV (blue), and data from the two SYNOP mosaics (red: mosaic starting on 22 June; orange: mosaic started on 23 June).
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