# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0538531        0.00646844    
     0.460000          0.700000         0.0386932        0.00788363    
     0.700000           1.00000         0.0181388         0.0137348    
      1.00000           2.40000         0.0144668         0.0168951    
      2.40000           4.80000         0.0554284         0.0275913    
      4.80000           10.0000         0.0668981         0.0501188