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. Author manuscript; available in PMC: 2014 May 6.
Published in final edited form as: IEEE Trans Biomed Eng. 2014 Feb;61(2):522–534. doi: 10.1109/TBME.2013.2283501

Fig. 9.

Fig. 9

The calculated axial force Fz versus the actual value using linear fitting with the samples with sweep angle β less than 15° (a), its residual error (b), and the histogram of the residual error (c). The calculated axial force Fz versus the actual value using second-order Bernstein polynomial fitting with all calibration data (d), its residual error (e), and the histogram of the residual error (f).