# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.115810         0.0401344    
     0.460000           1.00000         0.0118910         0.0225782    
      1.00000           1.54000         0.0404470         0.0129106    
      1.54000           2.40000         0.0235180         0.0117189    
      2.40000           4.80000         0.0518346         0.0102309    
      4.80000           10.0000         0.0698046         0.0109881