# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0788113        0.00289896    
     0.460000          0.700000         0.0878332        0.00331480    
     0.700000           1.00000         0.0932023        0.00413446    
      1.00000           1.54000          0.107279        0.00515995    
      1.54000           2.40000          0.125942        0.00760428    
      2.40000           4.80000          0.112670         0.0151133    
      4.80000           10.0000          0.158861         0.0266473