# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.120407         0.0250524    
     0.460000          0.700000          0.156965         0.0138259    
     0.700000           1.00000          0.157714        0.00629329    
      1.00000           1.54000          0.151313        0.00328922    
      1.54000           2.40000          0.139923        0.00292712    
      2.40000           4.80000          0.125104        0.00312735    
      4.80000           10.0000         0.0998432        0.00450340