# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.290716        0.00417130    
     0.460000          0.700000          0.303702        0.00463481    
     0.700000           1.00000          0.348065        0.00654029    
      1.00000           1.54000          0.356329        0.00657444    
      1.54000           2.40000          0.327937        0.00783128    
      2.40000           4.80000          0.236759        0.00784276    
      4.80000           10.0000          0.182451        0.00999527