Supplementary material for define inter-bout-interval from Fin whale singing decreases with increased swimming speed

Figure_S1: Distribution of all inter-song-intervals (n = 7877) for 163 singers. The biexponential curve fit to the log frequency distribution was used to calculate the bout ending criteria (BEC) value of 35 minutes (intersection of the dashed line data with the x-axis). By this criterion, a singer sang multiple bouts if there was an inter-song-interval in his track 35 min.