# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0748628        0.00874119    
     0.460000          0.700000         0.0610506        0.00583980    
     0.700000           1.00000         0.0645408        0.00518031    
      1.00000           1.54000         0.0603202        0.00378083    
      1.54000           2.40000         0.0587042        0.00535945    
      2.40000           4.80000         0.0515449        0.00571938    
      4.80000           10.0000         0.0317216         0.0120158