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. 2016 Sep 3;31(3):329–338. doi: 10.1264/jsme2.ME16091

Fig. 4.

Fig. 4

Biogas production from groundwater samples amended with YPG medium incubated at temperatures that were 10°C higher than those of groundwater samples measured at the outflow of deep wells. Data points were obtained from the measurement of cumulative H2 (○), CH4 (■), and CO2 (×) in the gas phase of the culture bottles.