# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0147278        0.00377408    
     0.460000          0.700000         0.0125596        0.00337054    
     0.700000           1.00000        0.00175588        0.00484577    
      1.00000           1.54000        0.00551361        0.00323210    
      1.54000           2.40000         0.0137227        0.00323263    
      2.40000           10.0000        0.00395841        0.00347037