# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000         0.0519185        0.00970262    
      1.54000           2.40000         0.0366475        0.00916233    
      2.40000           4.80000         0.0294904         0.0103757    
      4.80000           10.0000         0.0166434         0.0155980