Appendix G Box Plots for Category B and C Air Toxics Schematic for Box Plot a SigmaPlot© 8.02 was used to produce the box plots. This program does not follow the true definition of a box plot where the whiskers represent 1.5 times the interquartile range. Outliers 90 th percentile a 75 th percentile Mean Median 25 th percentile 10 th percentile a Appendix G - 1