# Spectral index    Center Frequency
-4.00000     85.453782
-3.50000     85.822352
-3.00000     86.199666
-2.50000     86.585006
-2.00000     86.977568
-1.50000     87.376465
-1.00000     87.780735
-0.500000    88.189355
 0.00000     88.601248
 0.500000    89.015301
 1.00000     89.430375
 1.50000     89.845321
 2.00000     90.258998
 2.50000     90.670285
 3.00000     91.078096
 3.50000     91.481391
 4.00000     91.879194
 4.50000     92.270596
 5.00000     92.654768