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Surface plot of the components of the a(p) mapping, (a) the photoelectric component a1(p1, p2) and (b) the Compton component a2(p1, p2). In practice, the useful domain lies in (p1 ≥ 0.5, p2 ≥ 0.5) where the surface is smooth, which allows a gradient search. The high gradient of a1 amplifies contrast and noise during mapping.
