# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0294033         0.0160346    
     0.700000           1.00000         0.0286638         0.0241719    
      1.00000           1.54000         0.0386135         0.0171416    
      1.54000           2.40000         0.0683455         0.0179752    
      2.40000           4.80000         0.0539416         0.0261262    
      4.80000           10.0000         0.0219624         0.0824665