Fig. 1.
Near-UV snapshots and CO large scan images on 2017 September 15 measured by the IRIS/SJI and GST/CYRA. The green contours represent the umbra–penumbra boundary. Two blue lines outline IRIS slits, and double red lines mark the first and last (13th) slits of CYRA. The two magenta plus signs (+) in panel c indicate the umbra–penumbra boundary positions at the first CYRA slit. The cyan asterisk (*) in panel c indicates a crossover point between the slits of IRIS and CYRA at the sunspot umbra.
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