Fig. 2
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Comparison of 𝒹t𝓃 approximations provided by different transparent boundary conditions at 3.0, 5.2, and 8.0 mHz for the Atmo model at rt = 510 km. The reference is given by Eq. (13), and the boundary conditions S-HF-1a and SAI-1 from Barucq et al. (2020) are recalled in Eqs. (23) and (24). The LIE boundary conditions for N = 0 and N = 1 are obtained by solving the minimisation problem defined in Eq. (29).
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