From left to right the Ca ii K line from the observing runs with Mercator. At the top of the December and January panels the average of the four December 22 spectra and the average of the January spectra are plotted (red continuous lines) together with the template spectrum (blue dashed line). At the bottom the corresponding residuals are shown in red. To guide the eye, two Gaussians with FWHM 25 km s-1 (December) and 20 km s-1 (January) are plotted (black continuous line). The March panel shows the residuals of the average spectrum of each night. The May panel shows the average of five consecutive spectra of May 11 starting at the UT indicated in the panel. Some panels show the residuals of the Ca ii H line for comparison (blue dotted line). A 3σ error bar is plotted in some panels. The dash-dotted line at −3.0 km s-1 corresponds to the radial velocity of the star.
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