# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0396235        0.00429536    
     0.460000          0.700000         0.0368122        0.00596232    
     0.700000           1.00000         0.0316604        0.00859853    
      1.00000           1.54000         0.0510910         0.0109317    
      1.54000           2.40000          0.106207         0.0185021    
      2.40000           10.0000         0.0987827         0.0221077