# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0524587        0.00502839    
     0.460000          0.700000         0.0499147        0.00441599    
     0.700000           1.00000         0.0547286        0.00524212    
      1.00000           1.54000         0.0420493        0.00708939    
      1.54000           2.40000         0.0480050        0.00936874    
      2.40000           4.80000         0.0331068         0.0183668    
      4.80000           10.0000         0.0688826         0.0213997