Combined error (mm)

Coefficient of reliability

U1 (x)

0.19

0.885

U1 (y)

0.16

0.985

U2 (x)

0.17

0.994

U2 (y)

0.15

0.983

U3 (x)

0.13

0.998

U3 (y)

0.18

0.973

U3 (z)

0.17

0.998

APW

0.17

0.989

APL

0.20

0.971