Table 3.

Static error under different light intensities (mm).

Operator	Light Intensity
	Low	Medium	High	Superhigh
1	2.70	1.33	1.91	1.93
2	2.82	4.00	2.55	3.25
3	3.93	4.23	5.03	4.60
4	1.74	1.99	1.74	2.27
5	2.97	2.26	3.05	2.99
6	4.69	6.39	4.89	5.31
7	1.11	1.77	1.54	1.94
Mean (SD)	2.85 (1.21)	3.14 (1.81)	2.96 (1.46)	3.18 (1.32)