Top panels: m_bol and T_eff scaled ν_max,cal (left) and Δν_cor,cal (right) as a function of the observed parameters for the sample of RGB (red and green dots) and RC (blue dots) in NGC 6791 and NGC 6819, respectively. The dashed lines indicate linear fits (in log-log scale) to the RGB stars, which correspond to power-law fits in linear scale. The panels are plotted upside down so that bright stars are at the top. Middle and bottom panels: residuals to the fits. The blue dashed lines indicate the average offset of RC stars with the mean valuesand rms scatter given.