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Fig. 1.


Plot of log10f(x, y, a) for a = 10−3 and x, y ∈ [0, 10]. The two bold lines indicate the f = 10−10 and the f = 10−20 contours. Image values smaller than 10−30 are not plotted. We observe a rapid decay in the x direction. The qualitative behavior of log10f is similar for a ∈ [10−5, 10−1].

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