Example of a single exposure spectrum (top panel) and line-of-sight velocities (bottom panel) used in this work. The top panel depicts a spectrum of TU-UMa taken at HJD = 2 457 484.880667 day. The bottom panel shows the line-of-sight velocities derived in this work (black dots) and the velocities extracted from APOGEE data products (red squares). The gray dots represent estimated velocities that did not fulfill the criteria in Eq. (1).