# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0554846        0.00444529    
     0.460000          0.700000         0.0552819        0.00412156    
     0.700000           1.00000         0.0682451        0.00533416    
      1.00000           1.54000         0.0685433        0.00644613    
      1.54000           2.40000         0.0741426        0.00847052    
      2.40000           4.80000          0.109401         0.0101638    
      4.80000           10.0000         0.0980618         0.0155931