Figure 10
From: Methods for serial analysis of long time series in the study of biological rhythms
Motor activity of a rat submitted to different constant light intensities. The serial periodogram is shown on the right; the different light intensities are shown on the left. The periodogram used was the Lomb-Scargle with a section of 10 days length and a step of 1 day, and it is represented in a gray scale. The red overpainted line corresponds to the daily estimated period (maximum of the periodogram).