Fig. 1
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Geometry of the launching of a mesospheric sodium layer LGS. In this schematic view, the layer is approximated with a solid bandwagon of a thickness, ∆h0, located at an averaged height, h0. The curvature of the Earth is considered negligible, making the zenith distance, θ, the only parameter required to retrieve the equivalent range of h and the apparent thickness, ∆h.
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