From top to bottom: S/N of each of the individual spectra per pixel; the light curve of the chromospheric He I line at 5877.2 Å. The spectral line was integrated over a spectral range of 1.5 Å-wide; the dLW and CRX indices were derived using SERVAL; the light curve of the H_α line; the FWHM of CCF as estimated from DRS; the radial velocities were derived from SERVAL; and the radial velocities were derived from DRS. The vertical dashed cyan lines mark the predicted ingress and egress of transit of AU Mic b.