Figure 2
From: Aerosol emission in professional singing of classical music
Boxplots of the emission rates (left y-axis; bars represent the median for all replications of each task) for the test conditions breathing, speaking, and singing (denoted by hue and labeled at the bars) and the different voice classifications (baritone (red), tenor (green), alto (blue), soprano (magenta), as denoted in the x-axis) in experiment I. The emission rates for all particle size classes are cumulatively summarized. The black-framed boxes extend from the lower (Q1) to upper (Q3) quartile values of the data, with a thick line at the median. The lower and upper whiskers represent data greater than \(Q1-1.5\cdot (Q3-Q1)\) and lower than \(Q3+1.5\cdot (Q3-Q1)\), and stars denote outliers, respectively. For the test conditions speaking and singing, the median of the maximum sound pressure levels \(L_{AF_{MAX}}\) for all replications were denoted by full circles (values corresponds to the right y-axis). For breathing, the sound initiated by the technical equipment such as fans was higher than any acoustic sound expelled by the participants. Therefore, no \(L_{AF_{MAX}}\) are given. (Figure created with matplotlib 3.2.1, http://matplotlib.org).
