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Fig. 1

Bl, S-index, Hα, and Ca ii IR triplet indexes behavior for OU And (left) and 31 Com (right). For both stars, phases are computed for ephemeris HJD0 = 2 454 101.5 and the rotational period of 24.2 d for OU And and 6.8 d for 31 Com.
This figure is made of several images, please see below:
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