Radial velocities from PEPSI spectra. Shown is the CCF (top panels) and the wavelength coverage for one target for one visit (bottom panels). The target is the double-lined spectroscopic binary BY Dra. Panels show the full CCF with pixels binned by a factor five (top left, blue line) and the unbinned central 180 km s⁻¹ of the CCF (top right, blue line), both along with its Gaussian fit (orange line). The bottom panels are overplots of the observed (blue) and the synthetic spectrum (orange) for CD III (left) and CD V (right). The wavelength zones excluded from the CCF are shaded in grey.