Representative profiles obtained by the k-means classification of the Hα and Ca II K line profiles. Forty-one RPs (9−49) are presented in six groups in (panels a–f). The average quiet-Sun profile represented by RP−43 is shown in all the panels for comparison purposes. Representative profiles 0−3 (RBE profiles) and 4−8 (RRE profiles) are plotted in Figs. 2 and 3, respectively. Here, Iw represents normalizing factor for the intensity, I.
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