Characteristic timescale τ_eft (top) and intensity fluctuations A_gran (bottom) as a function of log g for our sample of LC (red) and SC (blue) stars. Solid lines correspond to power law fits. The dashed line in the top panel corresponds to a power law fit to effective timescales obtained from 3D simulations (Mathur et al. 2011). Diamond symbols indicate values obtained from the granulation spectrum of 3D hydrodynamical models (Samadi et al. 2013b) and the dotted line corresponds to a power law fit to these models. The dashed line in the bottom panel shows the relation between the 8 h-flicker amplitude and log g.