Table 2.

Setup accuracy data [in millimetres (mm)] in u and v directions (in mm)

Direction		UV ink group	Dark ink group	Significance. (two-tailed)
v	MD	−0.3	−0.3	–
	Σ	1.5	1.1	0.865
	σ	2.1	1.5	0.068
u	MD	−0.3	−0.8	–
	Σ	2.0	1.7	0.337
	σ	2.0	1.8	0.469

Σ, population systematic error; σ, population random error; MD, population mean displacement; UV, ultraviolet.