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Representative plots of the fit parameters for ξ=24 produced by points in the z=0 axial plane for φ=3 (the middle of a block). The fits found using Eq. 2 are plotted on top of the parameters found from Eq. 1 as a function of r and d, for (a) r0, (b) A, (c) σR, and (d) σL. In (a), r0 is not equal to the r position of the point source due to nonzero depth of photon interaction in the detectors, which moves the effective center of the response to lower r.
