Field data and predicted model of diapause probability. Data come from the Reichstett field area. Mean per week is shown in black dots. Grey dotted line is the associated curve trend. A logistic model of regression, considering week of collection, year and width of eggs is shown with a solid red line. Diapause incidence is in both cases higher when width measurements increase. Minimum and maximum values of observed diapause probability and predicted diapause probability are highlighted in horizontal long dashed lines, in grey and red, respectively. Model estimators are directly written on the plot.