a: Score plot according to subject distribution. The score plot depicts the multivariate relationships between the different subjects. The controls are coloured red and the TM patients black. The corresponding plot depicting the relationships between variables (i.e., loading plot) is shown in Figure 4b. 4b: Loading plot according to variable distribution. Loading plot depicts the multivariate relationships between the variables. For explanations of abbreviations see Table 1. The corresponding plot depicting the relationships between subjects (i.e., score plot) is shown in Figure 4a. The following acronyms are used: before pain provocation (bpp), after pain provocation (app), Max = maximum value, RMS = Root mean square value, Diff = Difference between the value before and after pain provocation, SI = strain (deformation), and SRI = strain rate (deformation rate).