# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0111132         0.0200351    
     0.460000          0.700000         0.0168337         0.0131257    
     0.700000           1.54000         0.0215113        0.00683841    
      1.54000           2.40000         0.0260096         0.0216264    
      2.40000           4.80000          0.223592        0.00729551    
      4.80000           10.0000          0.159734        0.00509901