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Digital comparison of dimensions of NIOSH Medium digital headform (d-HF) file and Static Advanced Headform (StAH) in a) front, b) left side, c) right side, and d) rear views. The vertical scale to the right of each figure ranges from +5 mm (red) to -5 mm (violet); the colors on the headform show the corresponding registration differences. The d-HF file is the reference for each registration (color figure available online).
