# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.579751        0.00692786    
     0.460000          0.700000          0.593629        0.00684138    
     0.700000           1.00000          0.647565        0.00860311    
      1.00000           1.54000          0.718582         0.0145928    
      1.54000           2.40000          0.675260         0.0199223    
      2.40000           4.80000          0.558216         0.0264563    
      4.80000           10.0000          0.380165         0.0418186