Table 2.

Root mean square errors of external acceleration (unit: m/s²).

	Method A	Method B	Method C	Method D	Method E
Test 1	0.31	0.38	0.34	1.07	0.65
Test 2	0.27	0.83	0.33	1.25	0.85
Test 3	0.33	0.59	0.35	1.47	1.01