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Fig. 2
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Histograms of the average pixel-brightness distributions for the (a) UVS and (b) STIS images used in this work. The position of the 75th (UVS) or 50th (HST) percentile cut-off has been annotated with a dashed black line. The plot has been truncated at a percentage pixel value of 0.1 to highlight the position of the cut-off.
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