# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0107540         0.0122185    
      1.00000           1.54000         0.0274863        0.00272261    
      1.54000           2.40000         0.0297850        0.00163009    
      2.40000           4.80000         0.0336318        0.00141943    
      4.80000           10.0000         0.0325713        0.00192220