Time series RV of an 'active' (λ_tpl,l = 6661.25 Å, top left, dots) and 'inactive' (λ_tpl,l = 7855.92 Å, top left, squares) line for J07446+035 (YZ CMi). The panels below show the time series of the CCF RV, FWHM, contrast, and BIS, and the CRX, dLW, and I_Hα computed by serval (left), together with their correlation with the RV of the individual line (middle and right). The text in the time series panels shows the scatter of the data, computed as their weighted standard deviation (wstd). The text in the correlation panels shows the Pearson's correlation coefficient (R). All data points are colour-coded with the stellar rotation phase. Observations removed as explained in Sect. 3.3 are marked in grey.