# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0398232        0.00683785    
     0.700000           1.00000         0.0630231        0.00572689    
      1.00000           1.54000         0.0762853        0.00210044    
      1.54000           2.40000         0.0840051        0.00142566    
      2.40000           4.80000         0.0886387        0.00128585    
      4.80000           10.0000         0.0772938        0.00165885