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Fig. 1. (Ai-Di) Time-averaged plume boundaries of titanium tetrachloride smoke
plume in 25 cm s-1 wind as viewed from above. (Ai) Point-source
plume, 2.4 cm wide at the source, spreads to 7.7 cm wide at the downwind end.
(Bi) Ribbon plume, 1.5 cm wide at the source, spreads to 6.1 cm wide at the
downwind end. (Ci) Wide plume, 17 cm wide at the source, spreads to 26.5 cm at
the downwind end. (Di) Cylinder plume, 7.6 cm wide at the source, spreads to
68.1 cm at the downwind end. In this figure, wind flows from left to right.
Schematic illustrations of the pheromone sources are depicted at the upwind
end of each plume envelope. Broken rectangles represent the boundaries of the
experimental arena. (Aii-Dii) Vertical cross-section of time-averaged plume
boundaries of titanium tetrachloride smoke plume in 25 cm s-1 wind.
(Aii) Point-source plume, 2.8 cm high at the source, spreads to maximum of
22.4 cm and decreases to 8.4 cm at the downwind end. (Bii) Ribbon plume, 2.2
cm high at the source, spreads to maximum of 22.2 cm and decreases to 10.1 cm
at the downwind end. (Cii) Wide plume, 5.6 cm high at the source, spreads to
maximum of 38.4 cm and decreases to 22.4 cm high at the downwind end. (Dii)
Cylinder plume, 56 cm high at the source (maximum), spreads to 54.3 cm at the
downwind end.
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