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Fig. 1

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He iλ4026 line. The left panel shows its time series and the right panel shows the night-to-night residuals. The time increases from bottom (2011-02-19) to top (2011-02-27), and for a better visual inspection of the spectra, they are slightly shifted along the vertical axis with offsets proportional to the interval between the observations, considering the barycentric Julian dates.

This figure is made of several images, please see below:

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