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Fig. 3. Formation of dimethylselenide (DMSe) along with a decrease of spiked dimethyldiselenide (DMDSe) measured in the head space samples. Dimethyldiselenide symbols (top figure): {blacksquare}, autoclaved soil (10% moisture); {blacktriangleup}, autoclaved soil (100% moisture); •, non-autoclaved soil (10% moisture); {diamondsuit}, non-autoclaved soil (100% moisture).