Data underpinning the publication: "Optical frequency metrology in the bending modes region"

Supplementary Table I is an Excel file that reports all measured CO2 transition frequencies vs HITRAN values. Supplementary Table II is an Excel file that reports all measured benzene transition frequencies together with those calculated with a new Hamiltonian for the excited state, The terms of this Hamiltonian were determined from the fitting to the experimental dataset. Weighting factors adopted in the fitting are reported for each line of this dataset. The files "Figure 2 full.fig" and "Figure 4 full.fig" provide in a Matlab format the raw data of the experimental absorption spectra plotted in Fig. 2 and Fig. 4, respectively. These data underpin the determination of the line center frequencies reported in the Excel files, for CO2 and benzene. "Supplementary figure 1.fig" and "Supplementary figure 2.fig" provide the raw data of the corresponding figures in the Supplementary material. They provide the electrical spectra of the comb-QCL and comb-CO2 laser beat notes, respectively.