Fig. 2

The range of cardinal temperatures is described by the germination rate for each percentile (the inverse of the germination rate) for each temperature. The solid lines correspond to the values predicted by the model functions and the symbols represent the experimental data: (a) linear model with 92% fit, (b) segmented model 1 with 76% fit, (c) segmented model 2 with 76% fit, (d) beta model 1 or curvilinear model with 96% fit.