Emission spectra of the six planetary instellation scenarios produced by the GARLIC radiative transfer model. The spectra are produced using a spectral resolving power of R = 100 across a wavelength range of 5.0–20.0 µm. (a) Scenarios with Earth biomass emissions at the surface. (b) Scenarios without Earth biomass emissions at the surface. (c) Difference between the biotic and abiotic scenario fluxes at each respective instellation.