# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000         0.0369319        0.00630277    
     0.700000           1.00000         0.0429129        0.00971109    
      1.00000           1.54000         0.0401980         0.0102448    
      1.54000           2.40000              -NaN              -NaN    
      2.40000           4.80000         0.0134054         0.0392231    
      4.80000           10.0000         0.0799769         0.0298083