Figure 4
From: Long-Term Monitoring of Dolphin Biosonar Activity in Deep Pelagic Waters of the Mediterranean Sea

Boxplot of the number of clicks recorded per hour in each month. In each box, the central mark indicates the median, and the bottom and top edges of the box indicate the 25th and 75th percentiles, respectively. Whiskers extend to the most extreme data points not considered outliers, and outliers are plotted individually using the ‘+’ symbol (in red). (a) Data acquired in 2005; (b) Data acquired in 2006.