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We present the results of analysis of the errors introduced by hot-band transitions 11 1 0-01 1 1, 03 1 0-01 1 1, 12 0 0-12 0 1 of the CO 2 molecule and the absorption lines of the H 2 O and NO 2 molecules in determination of the temperature and partial pressure of CO 2 , included in the gas mixture CO 2 :N 2 :H 2 O:NO 2 at atmospheric pressure, by multiple-frequency laser probing using a CO 2 laser tunable over the lines of the 00 0 1-[10 0 0,02 0 0] I,II ground-state laser transitions.