# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0476774         0.0416628    
     0.700000           1.00000         0.0548153         0.0382187    
      1.00000           1.54000         0.0266537         0.0237687    
      1.54000           2.40000         0.0193641         0.0100587    
      2.40000           4.80000         0.0228167        0.00605599    
      4.80000           10.0000         0.0294128        0.00681422