Dataset related to Figure 2, publication: E. Fasci et al 2023 J. Phys.: Conf. Ser.2439 012017

Data have been acquired by means of a comb-calibrated frequency-stabilized cavity ring-down spectrometer. They represent the absorption spectrum of the 3_(2,2)→2_(2,1) H_2O line, belonging to the nu_1 + nu_3 band, recorded under a continuous flux of high-purity N_2, while keeping the pressure to the constant value of 4 kPa. This work received funding from the EURAMET-EMPIR program cofinanced by the participating states and from the European Union's Horizon 2020 research and innovation program through the PROMETH2O project, coordinated by Vito Fernicola.