Pencil beam simulated spectra of H₂O(1₁₀ − 1₀₁) for limb (black lines) and nadir (red lines) geometries for Ganymede’s atmosphere with different SSL, 10° (panel a) and 60° (panel b). The receiver was positioned just outside the atmosphere at 500 km. The tangent heights of the line of sight for the limb geometries are 250 km and 50 km altitudes for SSL 10° and 60°, respectively. Dashed lines represent the LTE simulated spectra and solid lines represent the simulated spectra including the non-LTE model.