y1

y2

y3

y4

y1

1.0000

0.9941

0.9963

0.9781

y2

0.9941

1.0000

0.9900

0.9590

y3

0.9963

0.9900

1.0000

0.9841

y4

0.9781

0.9590

0.9841

1.0000