Fig. 4
Time-series of the Br10 line of HR 5907 (left) and HR 7355 (right). Stellar rotational phases for each spectrum are indicated to the right. The dotted lines indicate stellar rotation velocities derived from optical spectroscopy, while dashed lines indicate the peak emission found for Hα (Grunhut et al. 2012; Rivinius et al. 2013).
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