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Comparison between diffusion equation, Monte Carlo method and SPN approximations in the homogeneous phantom when g = 0.0 and nb = 1.37. The ratios of (a), (b) and (c) are 100.0, 5.0 and 2.0 respectively. MC/SPi (i = 1, 3, 7) denote the ratios and “SPj to SP7” (j = 1, 3) are the relative errors.
