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The colour difference map represents the difference between the tibial bone models. a Superposition of 3D-FDM and 3D-CT tibia models in case No.3. The maximum and minimum values of the colour difference map were + 0.5000 and − 0.5000 mm. b Superposition of 3D-GAS and 3D-FDM tibia models in case No.3. The maximum and minimum values of the colour difference map were + 0.2000 and − 0.2000 mm
