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A typical example of the normal-gamma-gamma (NGGs) model, fit to the distribution of t-statistics for IC 38. The distribution (gray) is relatively well described by a mixture of a normal (green), positive gamma (red), and negative gamma (blue). The full model fit is shown in black, and cutoffs (μ ± 4σ) are determined from the estimated mean (μ) and SD (σ) of the normal. Thresholded SMs include only voxels with positive t-statistics: t > μ + 4σ.
