# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.204459        0.00188207    
     0.460000          0.700000          0.243034        0.00169090    
     0.700000           1.00000          0.247686        0.00210750    
      1.00000           1.54000          0.256501        0.00175081    
      1.54000           2.40000          0.268850        0.00203306    
      2.40000           4.80000          0.256949        0.00225028    
      4.80000           10.0000          0.225537        0.00322049