Table 1.

The half-angle rule at different tertiary eye positions with the body upright

	Half-Angle Rule
Animal (Day)	20° Left	10° Left	0° (= Center)	10° Right	20° Right
M1 (1)	0.61 ± 0.05	0.66 ± 0.04	0.59 ± 0.06	0.55 ± 0.07	0.53 ± 0.05
M2 (1)	0.57 ± 0.03	0.67 ± 0.06	0.75 ± 0.09	0.86 ± 0.05	0.86 ± 0.06
M2 (2)	0.52 ± 0.07	0.59 ± 0.08	0.55 ± 0.06	0.45 ± 0.11	0.41 ± 0.07
M3 (1)	0.93 ± 0.07	0.78 ± 0.08	0.69 ± 0.06	0.63 ± 0.04	0.57 ± 0.05
M3 (2)	1.21 ± 0.09	1.09 ± 0.18	0.85 ± 0.06	0.76 ± 0.04	0.78 ± 0.16
M4 (1)	0.62 ± 0.12	0.59 ± 0.05	0.54 ± 0.04	0.42 ± 0.07	0.37 ± 0.04
M4 (2)	0.44 ± 0.06	0.39 ± 0.09	0.40 ± 0.08	0.33 ± 0.14	0.43 ± 0.36

Measures of the half-angle rule (±95% confidence intervals) (i.e., slope of regression fit to the data as in Fig. 2B), for all monkeys and days tested, at different horizontal eye positions. Values are given for each of the five horizontal eye displacements and the measures were made by taking stimulation data across the five vertical targets and each of the horizontal eye positions (except for M1 who had three vertical targets at the noncenter horizontal eye positions). Note that the left nerve was stimulated in animals M1 and M3, whereas the right nerve was stimulated in animals M2 and M4.