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Total amount of toluene (in micrograms) released from poplar into the upper cuvette compartment. Toluene was adsorbed with Chromosorb traps, and the toluene concentration was determined by GC-MS. The amount of evapotranspired toluene was calculated per square centimeter of leaf area. The data are the means of three replicates; standard deviations are indicated by error bars.
