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PO maps on 1,000 RFX analyses on different subgroups. A: With a subgroup size of 20 subjects, selected randomly from our sample. B: With a subgroup size of 30 subjects selected randomly from our sample. All PO maps were generated at a threshold of 90%, and each RFX analysis was thresholded at P < 0.001 (uncorrected). [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]
