Example 11.5.2

x1={1,.657,.411,.574,.34,.213,-.09,-.049,-.033};
x2={.657,1,.689,.509,.755,.548,-.017,.008,.028};
x3={.411,.689,1,.275,.536,.722,.039,.037,.091};
x4={.574,.509,.275,1,.693,.295,.055,.038,.023};
x5={.34,.755,.536,.693,1,.725,.059,.068,.074};
x6={.213,.548,.722,.295,.725,1,.03,.028,.102};
x7={-.09,-.017,.039,.055,.059,.03,1,.851,.817};
x8={-.049,.008,.037,.038,.068,.028,.851,1,.901};
x9={-.033,.028,.091,.023,.074,.102,.817,.901,1};