Fig 5. Boxplots showing the variation between subjects within each method.

For each box, the central line indicates the median. The bottom and top edges indicate the first quartile q₁ and third quartile q₃, respectively. The whiskers extend to the most extreme data points not considered as outliers. Outliers are shown individually as ‘+’ on the plots. Outliers are hereby defined as values larger than q₃+w(q₃-q₁) or smaller than q₁-w(q₃-q₁), where w is the maximum whisker length.