A clear trend in the intensity of the methane peaks with time were observed, and this trend is presented in two forms in Figure 5B .
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<i>In situ</i> Raman quantitative monitoring of methanogenesis: Culture experiments of a deep-sea cold seep methanogenic archaeon.
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Therefore, when we analyzed the obtained spectra, we focused on the peak of CO 2 , which also showed a slightly increasing trend throughout the 12-day monitoring (5 out of 12-day data are shown in Figure 7 ).