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Chemistry

	Fig. 1A. An HP 6890 Gas Chromatograph, equipped with an FID for rapid determination of hydrocarbons C1, C2, C3, and C3+.
	Fig. 1B. An HP 6890 Gas Chromatograph (GC), equipped with an FID for determination of hydrocarbons up to C7. This GC (NGA) also has a TCD for determination of nonhydrocarbon gases.

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