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Two training masks drawn on the SDO-AIA 19.3 nm image on April 23, 2013 at 00:00:07 UT. Red contours are the AR class, green contours are the QS class, and cyan contours are the CH class. (a) Manual segmentation that selects extended ARs. (b) SPoCA segmentation that selects the core of ARs. The QS class consists of the pixels that are neither AR nor CH.
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