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Distribution of Aedes albopictus males along the first two discriminant factors (DF) of shape analysis by altitude groups. This distribution was based on the partial warps. Horizontal axis: discriminant factor 1; Vertical axis: discriminant factor 2. Altitude groups: A1 (158 m), A2 (595 m), A3 (762 m), A4 (1099 m), A5 (1140 m).