Scatter plot between occurrence (in percentage) and the average decorrelation time (in minute) in bins of occurrence ~ 1% wide (corresponding to 10 frames). The different colours and the vertical dashed lines separate different regimes in the plot. The solid line corresponds to the best fit of data from a polygonal model up to an occurrence of 65%. Top left inset: local slope of data points as a function of occurrence. The different regimes detected correspond to nearly constant slopes of 0.77 (in red), 1.10 (in orange), and 1.44 (in blue).