Power spectra of the two-dimensional fields Bx (continuous line) and Bz (dashed line), summed over all wave numbers ky, for the three cases BTD (orange), BEx2PP (red), and BEx2 (black). Left: at the bottom boundary. Right: at the tenth pixel in height. Spectra are normalized to their maximum value, and the spatial resolution is taken to be 1 in both directions (i.e., the wave number kx has the dimension of pixel-1 and is normalized to the total number of modes).
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