X₅

X₆

X₇

X₈

X₅

1.000

0.971

0.943

0.985

X₆

0.985

0.970

0.950

1.000

X₇

0.943

0.867

1.000

0.950

X₈

0.971

1.000

0.867

0.970

均值

0.9748

0.9520

0.9400

0.9763