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Fig. 1. Schematic of system developed to measure total hydrocarbon (THC) fluxes from petroleum-contaminated soils. (A) THC gradient ({partial}C) measurement equipment and instrumentation. (B) Micrometeorological instrumentation to determine eddy diffusivity (K). (C) Data acquisition and control system to integrate gradient measurement with micrometeorological measurements. (D) Supplemental data acquisition using data-loggers.