Effect of coarse-graining the γDor star KIC005038228. Top panel: coarse-grained light curves for an increasing τ, which indicates the scaling factor. We use an offset of 20 000 per step (τ) for visualization purposes. Bottom left panel: amplitude spectrum of the original light curve in black. The dashed lines are the Nyquist frequencies at each scaling factor, and illustrate the low-pass filter effect that occurs due to coarse-graining. It is clear from this that the low-pass filter removes the higher frequencies at each step. Bottom right panel: corresponding multiscale entropy curve. Each point on the curve represents the sample entropy calculated for a particular scaling factor.