Table 2. Mean (M) and standard deviation (SD) of the measured coordinates calculated for each perspective, and the absolute differences between the two trials.

		Trial 1 (mm)		Trial 2 (mm)		| Diff Trial 1-Trial 2 (mm) |
		M	SD	M	SD	M	SD	rTrial1-Trial2	pTrial1-Trial2
	Coordinates in x-axis
Observer 1
	45 deg	373.07	252.74	372.03	252.40	1.17	0.63	0.360	0.029
	60 deg	376.36	252.20	376.08	246.83	0.96	0.60	-0.046	0.407
	75 deg	375.12	252.27	375.28	251.71	0.66	0.56	-0.456	0.006
	90 deg	376.61	251.82	379.83	251.59	3.30	1.77	-0.169	0.191
Observer 2
	45 deg	373.57	252.72	373.20	252.46	0.53	0.50	0.260	0.086
	60 deg	376.85	252.27	377.27	252.21	0.55	0.42	0.288	0.065
	75 deg	376.01	252.20	376.04	252.11	0.37	0.30	-0.040	0.419
	90 deg	380.00	251.67	380.22	251.46	0.50	0.32	-0.191	0.160
Observer 3
	45 deg	371.77	252.91	379.52	251.49	7.79	4.10	-0.357	0.029
	60 deg	376.61	251.82	376.21	252.19	0.77	0.88	0.186	0.166
	75 deg	375.25	252.07	375.80	252.17	0.60	0.38	0.171	0.187
	90 deg	379.35	251.52	379.52	251.49	0.63	0.44	0.154	0.212
Coordinates in y-axis
Observer 1
	45 deg a	226.53	187.73	227.03	187.26	0.95	0.78	-0.041	0.416
	60 deg a	228.33	187.58	228.47	183.41	0.81	0.60	-0.059	0.380
	75 deg a	227.30	187.40	227.62	188.00	0.85	0.68	0.121	0.266
	90 deg a	228.15	187.58	228.00	187.18	0.81	0.65	0.089	0.323
Observer 2
	45 deg a	226.34	186.79	226.49	187.74	0.51	0.35	0.121	0.266
	60 deg a	228.20	185.99	228.21	187.74	0.41	0.32	-0.238	0.107
	75 deg a	227.59	185.54	227.56	187.56	0.34	0.21	0.121	0.265
	90 deg a	227.63	187.54	227.19	187.90	0.83	0.48	-0.386	0.019
Observer 3
	45 deg a	226.59	187.78	227.84	187.45	1.28	0.90	-0.253	0.093
	60 deg a	228.15	187.58	228.44	187.39	0.64	0.56	-0.544	0.001
	75 deg a	226.98	187.28	227.10	187.50	0.40	0.38	-0.083	0.335
	90 deg a	227.48	187.79	227.84	187.49	0.77	0.50	0.016	0.468

Heteroscedasticity assessment is presented as the correlation between the mean of the two trials and their absolute difference.

^a data square-root transformed to assess correlation after normality test failure