Distributions of log R′_HK,PHOENIX values in (a) T_eff versus log g, (b) T_eff versus [Fe/H], and (c) [Fe/H] versus log g parameter spaces for the solar-like stars investigated in this work. The stellar chromospheric activity levels of very active, active, inactive, and very inactive are indicated by different colors. The values of log R′_HK,PHOENIX that fall outside the range of the color bar are represented by the boundary value. The data points with smaller log R′_HK,PHOENIX are overlaid by the data points with larger log R′_HK,PHOENIX. The positions of the solar log R′_HK,PHOENIX are marked in the diagrams with a (*) symbol colored in accordance with the solar activity level.