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Normalized absorption spectra of a 125 ppbV CO mixture (scatter) and Voigt fit results (red line). The residual of the fitting procedure is shown in the bottom graph. The acquisition time is 1 s. The measurement was carried out at a pressure of 70 mbar and at a temperature of 295 K. The effect of the PZT in the multipass cell is also shown: (a) PZT on; (b) PZT off.
