Diagram of the chromospheric and coronal activity for the late-type stars. The stars of the basic data set are marked as dots. The corresponding references are given above, or the summary table see Katsova & Livshits (2011). The investigated stars with measured Li abundance and with direct measurements of the indices (from the studies mentioned above) are marked as crosses inside the circles. According to the type of a cycle, the stars of group “Excellent” are marked as circles, the stars of “Good” group are indicated as asterisks; the Sun at the maximum and at the minimum is denoted by its own sign and connected by the direct line.