[O I] 63 µm + [C II] 158 µm/I_FIR Intensity Ratio emitted from the surface of a PDR as a function of the cloud density n and the FUV flux incident on the cloud G₀. The models in this ModelSet were created with the KOSMA-tau 2020 PDR code. The parameters were chosen to match as closely as possible those of the Wolfire-Kaufman 2020 models, so they may be more easily comparable. More details are in the FITS headers.