Results of EW_Hα for the low-resolution data and the results of the S-index (SHK) shown in the three upper panels. The left panel shows all the data, while the middle panel provides a magnified view of the results. The right panel shows S_HK. The three lower panels display the results of EW_CaH, EW_CaK for the low-resolution data, and EW_Hα for the medium-resolution data. In each panel, blue dots represent main sequence stars, while green dots represent giants. The red dots in the S_HK result panel are sourced from Zhang et al. (2020).