Coefficients for spectral estimation of spctrl.dat

a[ 1] =     1.261539 
a[ 2] =    -0.007693 
a[ 3] =    -0.646779 
a[ 4] =    -0.280604 
a[ 5] =     0.163693 
a[ 6] =     0.347676 
a[ 7] =     0.111247 
a[ 8] =    -0.337142 
a[ 9] =    -0.358043 
a[10] =     0.378774 

a0 =    0.003511