# 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         0.0417606        0.00769011    
      1.54000           2.40000         0.0520496        0.00292569    
      2.40000           4.80000         0.0566953        0.00190514    
      4.80000           10.0000         0.0621903        0.00207037