Fig. 2
A Variance explained by the principal components on the left, cumulative variance explained by the principal components on the right. B influence of the first four principal components visualized. The blue curve is the overall mean MEFVC shape. The green curve illustrates the influence of each principal component when the coefficient is increased to the 95th percentile, the red curve when the coefficient is decreased to the 5th percentile. Component 1 influences PEF and the descending limb without altering the angle of collapse or concavity. Component 2 pivots the descending limb around a fixed point, thereby also influencing PEF. Component 3 and 4 mainly model concavity in MEFVC