# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.125420        0.00184112    
     0.460000          0.700000          0.138116        0.00161934    
     0.700000           1.00000          0.146719        0.00211858    
      1.00000           1.54000          0.155523        0.00215125    
      1.54000           2.40000          0.154966        0.00254954    
      2.40000           4.80000          0.147752        0.00367069    
      4.80000           10.0000          0.129326        0.00524417