## Figure 2.
Box and whisker plot showing the percentual bias of the enzymatic technique. Box and whisker plot showing the percentual bias for the enzymatic technique (1).
Interpretation of the vertical axis e.g. 1.1 means a percentual bias of 10%. The box
represents the 25^{th}, 50^{th} and 75^{th} percentile; the whiskers represent the 5th and 95th percentile. The extremes, defined
as values more than three times the interquartile range, are the signs above and underneath
the whiskers. The grey line represents the 0% bias line.
Drion |