Coeff. for spectral estim. of SPCTRL.DAT

 a[ 1] =    1.261539
 a[ 2] =   -0.007696
 a[ 3] =   -0.646777
 a[ 4] =   -0.280603
 a[ 5] =    0.163692
 a[ 6] =    0.347674
 a[ 7] =    0.111247
 a[ 8] =   -0.337141
 a[ 9] =   -0.358043
 a[10] =    0.378774

 a0 =    0.003511