Table S4 A: Test results for deviations from the model predictions presented in Figure 3A (boreal climate zone). The parameter estimates given in Table S3 allow calculation of the intercept a and the slope b as denoted in equation 1 for any desired combination of the predictor variables czone (climate zone), urb (urban vs. rural), and recent (period before 1960 vs. period since 1960). The table shows the resulting intercept and slope values and the result of testing for significant differences (***: p < 0.001, n.s.: not significant). Gray-shaded fields indicate combinations which were not tested because they were not meaningful.