Table 2.

Angles (mean ± SD, in degrees) between Reid's planes X_REID, Y_REID, and Z_REID and semicircular canal planes

	XREID	YREID	ZREID	LA	LH	LP	RA	RH	RP
XREID	0	90	90	125.9 ±5.2	108.7 ±7.5	133.6 ±5.3	125.9 ±5.2	108.7 ±7.5	133.6 ±5.3
YREID	90	0	90	38.4 ±5.1	92.2 ±5.7	131.5 ±5.1	141.6 ±5.1	87.8 ±5.7	48.5 ±5.1
ZREID	90	90	0	100.1 ±6.2	19.9 ±7.0	105.6 ±6.6	100.1 ±6.2	19.9 ±7.0	105.6 ±6.6
LA	125.9 ± 4.8	38.4 ± 4.2	100.3 ± 5.7	0	90.6 ±	94.0 ±	103.4 ±9.5	87.1 ±10.0	15.3 ±7.2
LH	108.4 ± 7.8	92.3 ± 5.3	19.5 ± 7.4	91.1 ±6.3	0	90.4 ±	87.1 ±10.0	11.3 ±6.9	93.1 ±9.0
LP	133.8 ± 5.6	131.6 ± 5.0	105.2 ± 6.5	93.9 ±3.7	90.1 ±4.6	0	15.3 ±7.2	93.1 ±9.0	83.2 ±9.7
RA	125.8 ± 5.7	141.7 ± 5.9	99.9 ± 6.8	103.4 ± 9.5	87.0 ± 10.5	15.5 ± 7.4	0	90.6 ±	94.0 ±
RH	109.1 ± 7.3	88.0 ± 6.2	20.4 ± 6.9	87.2 ± 9.7	11.3 ± 6.9	92.2 ± 9.2	90.2 ±6.3	0	90.4 ±
RP	133.5 ± 5.2	48.6 ± 5.3	106.1 ± 6.8	15.0 ± 7.1	94.0 ± 9.0	83.2 ± 9.7	94.2 ±4.3	90.7 ±5.2	0
ZREID-R	89.8 ± 0.6	89.9 ± 0.3	0.6 ± 0.4	100.3 ± 5.6	19.6 ± 7.4	105.4 ± 6.4	100.2 ± 6.5	20.5 ± 6.8	106.1 ± 6.9

Angles listed are the direction angles (not Fick/Euler angles) between positive Reid's axes, +X_REID (anterior), +Y_REID (left), +Z_REID (superior), and positive tips of normal vectors perpendicular to semicircular canals as defined in the text and illustrated in Table 1A and Figure 4. Z_REID-R is as defined in Table 1A and B. Below the diagonal, left, and right values are separately averaged pooled over the N = 22 subjects; italicized values above the diagonal are for all N = 44 labyrinths, after mirror-imaging each labyrinth across the Y_REID (midsagittal) plane, and thus represent the best symmetric estimate of the overall dataset. Note that inter-SCC angles within a single labyrinth (bold values) are close to 90°.

L = left, R = right; A, H, P = anterior, horizontal, and posterior semicircular canals, respectively.