Fig. 5.
Photospheric profile of Ca II K spectra of HD 110411 and HD 183324. The dates and instruments are colour-coded as indicated in the legend. The core of the line varies, although neither a narrow feature nor transient events are clearly distinguishable. The red-dashed vertical line marks the radial velocity of the star. The red error bar shows the 3-σ standard deviation in the region close to the bottom of the line. This applies to all upcoming figures.
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