# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0134179        0.00316536    
     0.460000          0.700000        0.00890837        0.00365203    
     0.700000           1.00000        0.00836606        0.00438981    
      1.00000           1.54000        0.00178795        0.00761699    
      1.54000           2.40000         0.0156597        0.00503986    
      2.40000           4.80000        0.00923295        0.00861237    
      4.80000           10.0000         0.0152298         0.0139120