# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.186996        0.00776269    
     0.460000          0.700000          0.208759        0.00652724    
     0.700000           1.00000          0.227189        0.00820712    
      1.00000           1.54000          0.336833         0.0126972    
      1.54000           2.40000          0.382197         0.0232665    
      2.40000           4.80000          0.302953         0.0367505    
      4.80000           10.0000          0.248368         0.0981517