# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0320316        0.00471948    
     0.460000          0.700000         0.0317973        0.00459291    
     0.700000           1.00000         0.0335570        0.00546780    
      1.00000           1.54000         0.0334895        0.00560880    
      1.54000           2.40000         0.0236451        0.00803377    
      2.40000           4.80000         0.0364280         0.0122737    
      4.80000           10.0000         0.0278123         0.0205679