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Fig. 1

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Top: continuum image with sunspots (a), and magnetogram with active regions (b), both registered at the same time (6:00 AM) on 9 November 2011 by HMI/SDO. Bottom: results of running the workflow initial step on the images shown at the top, with umbra and penumbra regions (c) and active regions with different dimensions (d) identified.

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