# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.269021        0.00477587    
     0.460000          0.700000          0.273392        0.00437209    
     0.700000           1.00000          0.330028        0.00522255    
      1.00000           1.54000          0.404976        0.00750928    
      1.54000           2.40000          0.400779         0.0115221    
      2.40000           4.80000          0.319253         0.0167300    
      4.80000           10.0000          0.219906         0.0321525