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Regression of the first two discriminant factors (DF) of shape analysis on centroid size from Aedes albopictus females. Horizontal axis: centroid size of the wing; Vertical axis (A): discriminant factor 1, representing 24% of the total discrimination; Vertical axis (B): discriminant factors 2, representing 17% of the total discrimination. This regression was based on the partial warps. Regression line is shown. Squares indicate individual mosquitoes. Altitude groups: A1 (158 m), A2 (595 m), A3 (762 m), A4 (1099 m).