Upper panel: wavelength-dependent opacities of H₂O, CO, CH₄, CO₂, PH₃, and NH₃, in the spectral range between 4.55 and 4.5545 micron. Lower panel: K-table curves of the individual species (dashed lines, same color coding as in the upper panel), the total k-table obtained from premixing the opacities of all species in wavelength space (black solid line), and total k-table obtained with the method used in this work (red solid line).