# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0256839         0.0156535    
      1.00000           1.54000         0.0759005         0.0124685    
      1.54000           2.40000         0.0657897        0.00630530    
      2.40000           4.80000         0.0567727        0.00456330    
      4.80000           10.0000         0.0557953        0.00526470