# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00846985         0.0382862    
     0.460000           1.00000         0.0204543        0.00710486    
      1.00000           1.54000        0.00485077         0.0122549    
      1.54000           2.40000         0.0321976        0.00481788    
      2.40000           4.80000         0.0334026        0.00606684    
      4.80000           10.0000         0.0132965         0.0130035