# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.209517        0.00162097    
     0.460000          0.700000          0.214678        0.00159106    
     0.700000           1.00000          0.211591        0.00185481    
      1.00000           1.54000          0.218247        0.00236673    
      1.54000           2.40000          0.211556        0.00325002    
      2.40000           4.80000          0.193735        0.00442383    
      4.80000           10.0000          0.158162        0.00699643