		Respiratory motion [amplitude, period]
		[10 mm, 4 s]	[20 mm, 4 s]	[40 mm, 4 s]	Mean ± SD
Gimbal mechanical positional error	Mean ± SD [mm]	0.14±0.09	0.22±0.14	0.44±0.29
Gimbal mechanical positional error	Mean + 2SD [mm]	0.32	0.51	1.02
Correlation coefficient R	vs velocity [mm/s]	0.54	0.58	0.58	0.57 ± 0.02
Correlation coefficient R	vs acceleration [mm/s²]	0.27	0.35	0.45	0.36 ± 0.07