# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0638140        0.00193158    
     0.460000          0.700000         0.0588731        0.00165316    
     0.700000           1.00000         0.0536484        0.00169471    
      1.00000           1.54000         0.0490292        0.00172027    
      1.54000           2.40000         0.0462195        0.00200974    
      2.40000           4.80000         0.0411803        0.00266811    
      4.80000           10.0000         0.0376652        0.00404647