# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.498021        0.00432598    
     0.460000          0.700000          0.517356        0.00452547    
     0.700000           1.00000          0.522583        0.00573934    
      1.00000           1.54000          0.538428        0.00908786    
      1.54000           2.40000          0.513698         0.0127802    
      2.40000           4.80000          0.490736         0.0194473    
      4.80000           10.0000          0.437701         0.0373992