Table 2.

Precision of clearance coordinate system (Unit: m).

	Fitting Precision	Data Set 1		Data Set 2		Data Set 3
Section No.		Left Rail	Right Rail	Left Rail	Right Rail	Left Rail	Right Rail
1		0.025	0.030	0.020	0.024	0.021	0.011
2		0.012	0.011	0.020	0.013	0.029	0.029
3		0.008	0.013	0.016	0.011	0.018	0.017
4		0.010	0.008	0.013	0.016	0.016	0.015
5		0.019	0.021	0.012	0.008	0.015	0.020
6		0.009	0.008	0.009	0.008	0.018	0.007
7		0.008	0.008	0.012	0.021	0.019	0.018
Mean value		0.013	0.014	0.014	0.014	0.019	0.017