# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0390149         0.0279350    
     0.700000           1.00000         0.0171723         0.0544627    
      1.00000           1.54000          0.130448         0.0211565    
      1.54000           2.40000          0.175382         0.0124078    
      2.40000           4.80000          0.184193        0.00979157    
      4.80000           10.0000          0.142851         0.0116423