The highet amplitudes of the peaks on the b₂ or b₃ sequences as a function of the reddening-free magnitude W_I compared with the expected values for the solar-like oscillations calculated with Eq. (3). In the upper panel, the results of calculations with the three indicated values of s for models along one of the three isochrones (Age = 4 Gy, Z = 0.004) are shown. In the lower panel, results for the three isochrones at s = 0.93 are compared.