# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0592564         0.0109066    
     0.460000          0.700000         0.0451194        0.00879263    
     0.700000           1.00000         0.0348491        0.00794228    
      1.00000           1.54000          0.205468        0.00870792    
      1.54000           2.40000          0.838586        0.00938371    
      2.40000           4.80000          0.651932        0.00521509    
      4.80000           10.0000          0.321563        0.00421679