Three various subsamples of the spectral lines: black – all, orange – |r| ≤ 0.30, and blue – |r| ≤ 0.20. Top: absolute RVs versus time for the first CARMENES VIS season. Bottom left: histogram of the Pearson-r correlation coefficient when comparing the RVs from individual lines to the CRX. The criteria for the subsamples are illustrated here. Bottom right: zoomed-in GLS periodograms around the signal of interest of the RVs of the subsamples. The orange subsample still shows power at 2.23 days, whereas the blue subsample still has a nonsignificant bump but it is noise limited.