Fig. 2
Line-profile variations in the He i λ 4471 line in the 2009 (left) and 2010 (right) campaigns. The top panels show the dynamic spectra of the observed data in the heliocentric frame of reference. The bottom panels yield the secondary dynamic spectra. The labels on the vertical axis indicate the date of the first and last observation of each night in the format HJD − 2 455 000.
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