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X1= [   0.9600    0.9600    0.9600    1.0000    1.0000    1.0000    0.9600    0.9600];
   X2=[ 0.6300    0.6300    0.6300    0.6300    0.6300    0.6300    0.6400    0.6500];
    X3=[0.0040    0.0050    0.0050    0.0040    0.0040    0.0050    0.0020    0.0020];


Y= [ 20.5000   20.7500   21.0000   19.0000   16.5000   17.0000   19.0000   18.5000 ]

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