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Figure 4. Example radial error results. (a) Socket with mean radial error (MRE) > 0.25 mm clinically deemed in need of reduction and possibly shaping change (2/e). (b) Socket with MRE > 0.25 mm clinically deemed in need of enlargement and possibly shaping change (7/a). (c) Socket with MRE ≤ 0.25 mm deemed in need of sizing and possibly shaping change (10/b). x- and y-axes are radial and vertical distances, respectively, in mm. Scale range is -1.0 mm to +1.0 mm. Sanders JE, Severance MR, Allyn KJ. Computer-socket manufacturing error: How much before it is clinically apparent? J Rehabil Res Dev. 2012;49(4):567–82.http://dx.doi.org/10.1682/JRRD.2011.05.0097