# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.158064         0.0417804    
     0.460000          0.700000         0.0603147         0.0276909    
     0.700000           1.00000         0.0705483        0.00695785    
      1.00000           1.54000         0.0672908        0.00318053    
      1.54000           2.40000         0.0720039        0.00279584    
      2.40000           4.80000         0.0717417        0.00292780    
      4.80000           10.0000         0.0599198        0.00456343