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Fifteen new absorption lines were observed when studing CO2 absorption spectroscopy by wavelength modulation technique with a distributed feedback lase. The overtone spectra of CO2 around 1.3μm and the corresponding spectral parameters (i.e. positions, intensities, self-broadening coefficients) are presented. The intensity of the weakest line detected is 2.25163×-27cm-1/(molecule·cm-2) at the pressure of 667Pa, with a corresponding absorption of 3.88×10-8.