# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000        0.00488060         0.0121863    
     0.700000           1.00000         0.0346543        0.00956429    
      1.00000           1.54000         0.0458804        0.00516883    
      1.54000           2.40000         0.0457483        0.00420966    
      2.40000           4.80000         0.0349559        0.00382593    
      4.80000           10.0000         0.0321685        0.00446917