Estimated values of the cut-off flicker frequency f_g as a function of stellar parameters resulting from the MCMC analyses performed on periodograms of the selected SC Kepler targets. From left to right: stellar mass, radius, effective temperature, surface gravity, and apparent magnitude. Black dots represent targets with magnitude m_v ≤ 10 and gray dots targets with magnitude m_v > 10. The star symbol shows the solar cut-off frequency evaluated from VIRGO data (see Sect. 2.4). Pearson (ρ_P) and Spearman’s (ρ_S) coefficients, evaluated for stars with m_v ≤ 10, are indicated in each panel.