Activity level measured for Her-Lyr candidates is shown vs. color. The symbols exhibit individual measurements taken from the literature (Table 9). The symbols have the same meaning as in Fig. 9. The filled areas represent mean levels derived from the distributions of the Pleiades (horizontally hashed), Her-Lyr (gray), UMa (hashed), and the Hyades (vertically hashed). The widths are due to the uncertainty of the coefficients of the linear fits.