Figure 10.
Boxplots showing the percentage differences in focal peak intensity for each estimation method compared to that calculated from hydrophone measurements. For each box the central line indicates the median, the lower and upper edges of the box indicate the 25th and 75th percentiles, the whiskers indicate the range with data points considered outliers represented by single points. In the top graph (a) the data at all power levels are averaged, with separate boxplots from left to right for all (black), solid bowl (blue - centre), annular (red - right) and non-rotationally symmetric (mauve) transducers. The bottom graph (b) shows the data averaged across all transducers and separated from left to right into ‘low’ (black), ‘moderate’ (blue) and ‘high’ (red) drive power.