Spectral thermal redistribution efficiency factor as a function of the wavenumber or wavelength,which is computed as the luminosity of the night side over the luminosity of the day side in each band for the thin case (κ = 1.5 × 10^-5). The three different pressures are shown (10 mb: dotted; 100 mb: dashed; 1b: solid). The last band on the left (far IR) is not observable with JWST.