# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.457785        0.00343334    
     0.460000          0.700000          0.463118        0.00313794    
     0.700000           1.00000          0.460608        0.00316554    
      1.00000           1.54000          0.424466        0.00256307    
      1.54000           2.40000          0.369304        0.00290585    
      2.40000           4.80000          0.289521        0.00326156    
      4.80000           10.0000          0.203437        0.00421919