Transmission coefficient for one step embedded in a stably stratified medium, in an inclined box with Θ = π/ 4, for different rotation frequencies a) Ω = 0, b) and c) , as a function of frequency and of the vertical wave number. The white arrow indicates the frequency ω = f, while the vertical dashed red line indicates the frequency ω = 2Ω. The horizontal dashed black lines indicates multiple of π.