Baseline fits for EW_Hα (from both medium and low-resolution data), shown in the upper two panels, and the lower two panels show E W_CaK and EW_CaH (both from low-resolution data), along with the results after subtracting the baseline. The solid red line in the figure depicts the fitting line for the least active 2% of stars in the sample, while the black dashed line represents y=0. In the panel without subtracting the baseline, the color bar indicates the parameter log 𝑔. In the panel after subtracting the baseline, the color bar represents the number density.