Cross-correlation functions used for kinematic measurements in two slit sections. Upper panels: Fourier cross-correlation functions computed between the residual (excess) spectra and the spectrum of the G dwarf star HD 102070 for spectrum I (left) and II (right). Lower panels: enlarged view of the Fourier cross-correlation function peaks. The double peaks in both Fourier cross-correlation functions indicate the presence of two sets of absorption-line features at different velocities in the residual spectra. The more red-shifted peaks in the Fourier cross-correlation are at velocities V_LOS,1 = 5054, 5010 ( ± 55) km   s^-1, and the secondary bluer peaks are at V_LOS,2 = 3921, 3889 ( ± 55) km   s^-1.