# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0757988        0.00195591    
     0.460000          0.700000         0.0736871        0.00177131    
     0.700000           1.00000         0.0662661        0.00192994    
      1.00000           1.54000         0.0648613        0.00188071    
      1.54000           2.40000         0.0559586        0.00225625    
      2.40000           4.80000         0.0482615        0.00278864    
      4.80000           10.0000         0.0413725        0.00407213