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Absorption spectra of methane in the near infrared - NIST
in a cell 60 cm long. The light source in all cases was a tungsten filament. Figure 2 shows the results for the 1.56-p, region. The strong rotational lines of the P and R branches of the 2113 band of methane can readily be identified. About 19 lines are observed for the R branch with the 50-cm cell at atmospheric pressure. In addi
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