# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0154781        0.00692506    
     0.700000           1.00000         0.0231439         0.0109303    
      1.00000           1.54000         0.0319329        0.00846227    
      1.54000           2.40000         0.0226271         0.0115660    
      2.40000           4.80000         0.0307027         0.0122573    
      4.80000           10.0000         0.0407191         0.0168568