# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.143335        0.00170555    
     0.460000          0.700000          0.152953        0.00158590    
     0.700000           1.00000          0.153893        0.00180846    
      1.00000           1.54000          0.161544        0.00224251    
      1.54000           2.40000          0.157328        0.00327896    
      2.40000           4.80000          0.152251        0.00486233    
      4.80000           10.0000          0.135498        0.00842304