Figure 3.

Flight altitude of spring and autumn insect migrants in each size class plotted against percentage moon illumination and percentage cloud cover. The number of insects detected by the radars on each nightly sample is indicated by the size of the green and orange circles and the key at the top of the panels. Blue regression lines are shown only if the variable in question was significant in the generalized linear model (GLM), although the lines plotted are from the pairwise comparison rather than the GLM and therefore vary slightly from the model outputs. Associated statistics are presented in electronic supplementary material, table S2.