Table 2. Skin displacement of the three subjects at four postures (LB30°, LB15°, RB15°, and RB30°) in lateral bending.

Rotations	Vertebrae	S (mm)									Range of |S| (mm)
		X			Y			Z			X	Y	Z
		S1	S2	S3	S1	S2	S3	S1	S2	S3	–	–	–
	C2	3	14.5	4.5	−20.5	3.3	−17.5	7.5	7	2	3–14.5	3.3–20.5	2–7.5
LB30°	C5	0	6.6	16.5	−0.5	5.4	−3.5	0.5	3.5	−6.5	0–16.5	0.5–5.4	0.5–6.5
	C6	−1.5	7	12	1.5	6.6	1	1	5	−8.5	7–12	1–6.6	1–8.5
	C2	0	10.9	3	−20	0.8	−16	1	5	2	0–10.9	0.8–20	1–5
LB15°	C5	−3	7.4	21	5.5	2.9	−7	2	1.5	−6.5	3–21	2.9–7	2–6.5
	C6	0	5.2	16.5	3.5	4.6	−3.5	4	4	−7.5	0–16.5	3.5–4.6	4–7.5
	C2	1.5	12.7	1.5	−4	4.3	5	0.5	4.8	10.5	1.5–12.7	4–5	0.5–10.5
RB15°	C5	3	6.6	16.5	10.5	9.4	−3.5	−1.5	1.5	−6.5	3–16.5	3.5–10.5	1.5–6.5
	C6	1.5	8.8	15	9.5	7.1	−1.5	2	3.8	−8	1.5–15	1.5–9.5	2–8
	C2	3	14.5	4.5	−3.5	5.3	2	−1	8.3	16	3–14.5	2–5.3	1–16
RB30°	C5	1.5	7.4	13.5	11	8.4	−19.5	−1	4.5	−13	1.5–13.5	8.4–19.5	1–13
	C6	1.5	7	15	9.5	6.6	−13	2	4.3	−8	1.5–15	6.6–13	2–8