Components of the sky model in logarithmic radiance units for wavelengths between 0.3 and 4.2 μm. This example, with the Moon above the horizon, shows scattered moonlight, scattered starlight, zodiacal light, thermal emission by the telescope and instrument, molecular emission of the lower atmosphere, airglow emission lines of the upper atmosphere, and airglow/residual continuum. The scattered light and airglow components were only computed up to the K band because of their negligible importance at longer wavelengths. For the model parameters used, see Table 1.