# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0393325         0.0204389    
     0.460000          0.700000         0.0125914         0.0296607    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000              -NaN              -NaN    
      1.54000           2.40000         0.0140449         0.0135934    
      2.40000           4.80000              -NaN              -NaN    
      4.80000           10.0000         0.0418924        0.00907773