## 3 Discussion  
The self- and air collisional broadening coefficients for the H\({}_{2}\)O absorption line at 7299.43 cm\({}^{-1}\) have been measured employing direct tunable diode laser absorption spectroscopy (dTDLAS). Table 1 shows a summary of the collisional broadening coefficients and their respective temperature dependence exponent. As shown in Table 1, the parameters measured in this work for the H\({}_{2}\)O absorption line at 7299.43 cm\({}^{-1}\) agree within the reported uncertainties in the HITRAN 2020 database [26]. Compared to the uncertainties reported for the HITRAN 2020 data, an improvement (in the uncertainties of the line parameters reported in this work) by a factor of about 4, 1.3 and 4.4 has been reached for the self-broadening coefficient, the air broadening coefficient and the temperature dependence exponent coefficient for air broadening, respectively (see Table 1). The air broadening coefficient in this work also agrees with that in our previous work [9]. For the temperature exponent of self-broadening, no values are reported in HITRAN [26], and therefore no value from HITRAN is registered in Table 1. The relative deviation (well within the reported uncertainties for the HITRAN values) of the respective line data parameters are shown in the last row of Table 1. The results of this work in Table 1 were also compared to data in the GEISA database [27], resulting in similar relative deviations as for HITRAN [26], as shown in the last row of Table 1.  
The uncertainties of the results in this work were calculated applying GUM [28] principles and employing the GUM workbench software [46]. To demonstrate, Table 2 shows an example uncertainty budget (single pressure point from Figure 3) for the self-broadening coefficient \(\gamma_{\text{H2O}}\), showing the different input parameters (most significant quantities), values, standard uncertainties, relative standard uncertainties and relative contribution (index value [46]) of the uncertainties to the final uncertainty of \(\gamma_{\text{H2O}}\), and the combined relative uncertainty (2.0 %) of the measured self-broadening coefficient. As shown in Table 2, the relative uncertainties of \(p_{\text{H2O}}\) and \(\Delta v_{L}\) are 1.2% and 1.5%, respectively, with corresponding relative contributions of 39% and 61%, respectively. Thus, the 61% relative contribution here shows that \(\Delta v_{L}\) contributes the most to the combined uncertainty of \(\gamma_{\text{H2O}}\). The uncertainty budget for the heated cell measurements (\(n_{\text{air}}\)) is similar to Table 2. The relative uncertainties of the parameters (according to Equation (5)) \(\Delta v_{L}\), \(p_{\text{H2O}}\), \(p_{\text{air}}\) and \(T\) are 1.5% at 0.00269 cm\({}^{-1}\), 1.7% at 46.4 hPa, 1.1% at 1107.4 hPa and 0.52% at 573.15 K, respectively. It should be noted here that, similarly as for \(\gamma_{\text{H2O}}\), uncertainty budgets for \(n_{\text{H2O}}\), \(\gamma_{\text{air}}\) and \(n_{\text{air}}\) also revealed that, except for \(n_{\text{H2O}}\), the uncertainty of \(\Delta v_{L}\) is the most significant source of uncertainty for the combined uncertainties of the measured line parameters. This indicates that, to further increase the line parameters' accuracy (if at all required), future work should focus on reducing the uncertainty of \(\Delta v_{L}\).