Table 2.

Distortion values.

Item	1st Measurement Direction		2nd Measurement Direction
	Ri	Δi	Ri	Δi
1	29.0039	−0.021951	28.9778	−0.041757
2	58.0162	−0.050355	57.9644	−0.042748
3	87.0237	−0.065911	86.9740	−0.061112
4	116.0016	−0.076456	115.9721	−0.061893
5	145.0044	−0.079762	144.9961	−0.067778
6	174.0553	−0.082395	174.0393	−0.065835
7	203.1132	−0.079229	203.0897	−0.048521
8	232.1929	−0.063527	232.1630	−0.019044
9	261.2868	−0.037760	261.2486	0.018263
10	290.4139	0.007676	290.4194	0.039629
11	319.5688	0.084626	319.6433	0.061659
12	348.7565	0.164076	348.8699	0.095181
13	378.0469	0.194652	378.0526	0.226332
14	407.3608	0.258506	407.3291	0.330992
15	436.6681	0.383765	436.7842	0.321828
16	466.1053	0.461704	466.1020	0.503454
17	495.6124	0.545419	495.6529	0.536663