Sample: Reference counting chamber
In the figures of the particle and volume concentration, we show the mean results for each laboratory as a small, orange box. Whiskers extend to the minimum and maximum values. In the diameter figures, we show the results as a boxplot for each laboratory, consisting of the mean, the 95% confidence interval (orange boxes). The robust mean, based on the unfiltered data set, is presented as a bold black line. Mean laboratory results that lie out of scale have been entered as numbers.
The evaluation of the results follows DIN 38405 A45.