Pre-main-sequence stars in the VLASS × GCNS sample. Top panel: zoomed-in version of Fig. 3 with RS CVn variables removed. The cyan line represents the median fiducial and the red line shows the same fiducial shifted by −0.753 mag, which corresponds to an unresolved binary system of two identical stars. Therefore, stellar systems significantly above the green line cannot be explained simply by binarity. The top axis of the HR diagrams indicates the nominal stellar spectral types (Pecaut & Mamajek 2013). Bottom panel: residuals of M_G relative to the median fiducial (cyan).