Table 4.

Mean (standard deviation) values of usability.

Conditions	Usability (5-point Likert scale where 1 = Strongly Disagree and 5 = Strongly Agree)
	Ease of use	Usefulness	Stressfulness	Confusion
	How easy was it to use the cue?	How useful was the cue for collaboration?	How stressful was it to use the cue?	How confusing was the cue to understand?
Baseline	3.8 (1.1)	3.6 (0.9)	2.2 (1.2)	2.3 (1.2)
FoV	4.2 (0.9)	4.2 (0.9)	2.1 (1.1)	2.3 (1.0)
Eye-gaze	4.0 (1.0)	4.0 (1.0)	1.9 (1.0)	1.8 (1.1)
Head-gaze	4.6 (0.5)	4.2 (0.9)	1.8 (1.1)	1.7 (0.9)