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Box‐plots showing median, interquartile, and range for global efficiency (A) and local efficiency (B) in each group at the cost of 0.15. P values correspond to the significant level by means of a two‐sample t‐test. Note that there is an outlier (black plus sign) in the E glob of the control group. There would be significantly different in the E glob (P = 0.039) and E loc (P = 0.026) between the two groups if this outlier is removed.
