# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00892380         0.0130173    
     0.460000          0.700000         0.0279482        0.00791508    
     0.700000           1.54000        0.00953148         0.0124774    
      1.54000           2.40000         0.0665993         0.0120929    
      2.40000           4.80000         0.0387988         0.0242496    
      4.80000           10.0000         0.0292005         0.0569812