Table 2. The detailed data of marker motion during free-breathing and inter-CBCT session marker displacement using breath-hold.

Location		Range	Median absolute maximum amplitudes (IQR)	The 95th percentile values of marker motion
Marker motion during free-breathing
Ut	RL	-2.5 to 5.5	1.7(1.4)	3.5
	AP	-3.1 to 3.3	2.0 (1.5)	2.3
	SI	-9.1 to 1.1	3.6 (4.1)	6.5
Mt	RL	-1.6 to 2.2	0.8 (1.1)	1.7
	AP	-2.3 to 2.5	1.4 (1.2)	2.1
	SI	-16.4 to 2.0	4.8 (3.6)	8.3
Lt	RL	-4 to 1.8	1.8 (0.8)	3.5
	AP	-6.3 to 0.7	1.9 (2.0)	4.2
	SI	-15.9 to 0.6	8.0 (4.5)	12.6
Inter-CBCT session marker displacement using breath-hold
Ut	RL	-2.0 to 3.3	1.3 (1.0)	1.9
	AP	-1.7 to 2.4	1.1 (0.7)	1.4
	SI	-4.1 to 5.2	3.3 (1.8)	3.9
Mt	RL	-2.6 to 1.4	0.7 (0.7)	1.5
	AP	-1.7 to 1.9	1.1 (0.4)	1.4
	SI	-4.4 to 5.6	3.4(1.4)	4.5
Lt	RL	-4.7 to 5.2	2.0 (0.8)	2.5
	AP	-3.5 to 2.1	2.6 (2.2)	3.1
	SI	-5.7 to 5.2	3.5 (1.8)	4.1

Ut: upper thoracic esophagus, Mt: middle thoracic esophagus, Lt: lower thoracic esophagus /esophagogastric junction, IQR: interquartile range, RL: right–left on the x-axis, AP: anterior–posterior on the y-axis, SI: superior-inferior on the z-axis