Univariate distributions for a power-law power spectrum and different separation vectors x, demonstrating isotropy in 2D. Left panel: dashed: x/L = (0.3,0), dotted: x′/L ≈ (0.212,0.212), right panel: dashed: x/L = (0.03,0), dotted: x′/L ≈ (0.0212,0.0212).
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