"Dataset_in_Yoshida_et_al_2022.zip" includes the dataset used in the paper "Variations in vertical CO/CO2 profiles in the Martian mesosphere and lower thermosphere measured by the ExoMars TGO/NOMAD: Implications of variations in eddy diffusion coefficient." The dataset contains the CO/CO2 ratio at tangential altitude retrieved from the solar occultation channel of NOMAD. The dataset is separated at each orbit.