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. 2018 Oct 12;18(10):1221–1242. doi: 10.1089/ast.2018.1917

FIG. 1.

FIG. 1.

Summary of TLS measurements of CH4, both (a) including and (b) excluding the high spike data from year 1 (ca. January 2014). Data from Webster et al. (2015, 2018). TLS, Tunable Laser Spectrometer.