Fig. 9. The relationship between the relative length of winter, τw, as predicted from the models obtained. (A) The relative length of winter as a function of the geographical coordinates [τw = 3.63logit(-0.04ŴI) = -3.201916 +0.003548gwe +0.003656gsn + 0.121924h -0.000012gwegsn - 0.000732gsnh)], plotted against predicted values of WI, ŴI. (B) The relative length of winter as a function of the observed values of WI (τw = 3.63logit(-0.04WI), plotted against predicted values of WI, ŴI.