Characteristic granulation frequency (b_ν) as a function of the stellar atmospheric pressure scale height (computed in solar units) for COROT red giant stars (black). The figure is extracted from Kallinger & Matthews (2010). We added to the original plot the Kepler bright (magnitude < 10) main sequence targets (grey) shown in Fig. 8 and described in Sulis et al. (2020). Frequency b_ν for HR 10 has been inferred from both the averaged periodograms of the CHEOPS first visit (red, cyan) and TESS sector 29 (magenta, blue), adopting stellar parameters from stellar modelling with Gaia DR2 and DR3.