# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.393398        0.00389790    
     0.460000          0.700000          0.411073        0.00345478    
     0.700000           1.00000          0.463413        0.00419612    
      1.00000           1.54000          0.689118        0.00677607    
      1.54000           2.40000          0.721408         0.0117600    
      2.40000           4.80000          0.624451         0.0195182    
      4.80000           10.0000          0.410442         0.0397801