Fig. 3

Level lines of reflection |R| and transmission |T| coefficients of an IGW at a critical layer as a function of the Richardson number Ric and the thickness δ of the critical layer (zone II in Fig. 2). The top panels represent the level lines for an arbitrarily chosen value of (l,m) = (4, ± 3), while the bottom panels show level lines |R| = 1 and |T| = 1 for different couples (l,m).
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