Frequency-averaged velocity level as a function of M_⋆ measured above 125 μHz (circles, ) and below 30 μHz (diamonds, ) for the stars in our sample and for ℓ = 1 (left), ℓ = 2 (centre), and ℓ = 3 (right) modes. To avoid biases in the comparison, we do not consider for stars with ν_c, 1 < 40 μHz. In each panel, the mean values of the and distributions are shown by the dashed and dotted lines, respectively. In each panel, the mean velocity levels computed with the VIRGO/SPM solar time series are shown using the usual solar symbol, ⊙. The solar symbol enclosed by a square corresponds to , while the other corresponds to .