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Fig. 1. —Graph shows median of mean regional permeability values in low-grade tumors and high-grade tumors and mean for control regions in normal thalami. Error bars for regional permeability values represent 68% confidence interval calculated on basis of order statistics. Error bar for thalamic mean represents standard error. Note that values for high-grade tumors are substantially higher than those for low-grade tumors and that both differ substantially from thalamus values. Note also that no overlap of error bars is seen.

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