# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0756927        0.00664943    
     0.460000          0.700000         0.0808560        0.00668998    
     0.700000           1.00000          0.100427        0.00906446    
      1.00000           1.54000         0.0950076        0.00774207    
      1.54000           2.40000          0.114388        0.00945379    
      2.40000           4.80000         0.0793040         0.0135670    
      4.80000           10.0000         0.0652670         0.0251793