# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.292338        0.00271735    
     0.460000          0.700000          0.332865        0.00295294    
     0.700000           1.00000          0.377321        0.00349525    
      1.00000           1.54000          0.409308        0.00340880    
      1.54000           2.40000          0.400857        0.00401110    
      2.40000           4.80000          0.342715        0.00506064    
      4.80000           10.0000          0.247783        0.00715273