Table 2.

Values of the spellers’ size parameters.

Size	Measures (cm)			Visual angle (°)
	Speller size	Symbol size	Symbol distance	Speller size
Small	5.27	0.42	0.55	5°H × 5°W
Medium	9.98	0.79	1.04	9.5°H × 9.5°W
Large	14.69	1.17	1.53	14°H × 14°W

Note: MS stands for “speller size,” SS for “symbol size,” and SD for “symbol distance.”