Spectral parameters derived in Sect. 4. Confirmed BEER binaries are represented in green, while FAs are represented in red. For SB2s, only the spectral parameters of the primary are shown. For diluted BEER binaries, only the spectral parameters of the variable component are shown. The upper panel shows the two T_eff histograms. The lower three panels show the T_eff-log g, T_eff-metallicity, and T_eff-rotational broadening scatter plots. The vertical dashed lines mark T_eff = 5600 K – the approximate temperature of a G7V star. The horizontal dashed line in the lower panel indicates a rotational broadening of 20 km s^-1, below which the measured values are unreliable as a result of the medium resolution of the spectrograph (see Sect. 4).