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Fig. 6. Sample tracks of mosquitoes in response to (A) a ribbon CO2
plume, (B) 20% skin odour, (C) 20% skin odour after contact with a ribbon
plume of CO2, and (D) undiluted skin odour. Dots represent the
mosquito's position at intervals of 100 ms. Contact with the odour plume is
indicated by a light blue colour. B (left) shows two typical tracks of
mosquitoes flying through a diluted skin odour plume. Only rarely did 20% skin
odour induce sustained upwind flight to the odour source (right).