Table 2.

The mean value of the relative errors of each group of comparison in Fig. 4

	${\rho }^I$ (%)	${\rho }^{V^P}$ (%)	${\rho }^{V^N}$ (%)
Figure 4a	6.05	0.67	4.93
Figure 4b	6.51	0.71	3.52
Figure 4c	1.69	0.24	1.99
Figure 4d	1.92	0.19	1.35