Left: PHOEBE 2 model of primary component Aa (blue) and secondary component Ab (red) of binary A, using RVs calculated from KOREL as a mean of He I 4923, 5016, 6678 Å, and Hβ. Ephemeris of T_{0,  perpass} = RJD59995.64 + 8.23447 × E is used. Right: PHOEBE 2 model of primary component Ba of an eclipsing binary B, using radial velocities calculated from KOREL as mean of He I lines, Hα, and Hβ. Ephemeris of T_{0,  supconj} = RJD58627.15 + 5.852864 × E is used. Error bars are shown as a standard deviation of RVs computed from selected lines. RVs are corrected for systemic gamma velocities calculated for each segment of observations.