# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0951764         0.0383861    
     0.700000           1.00000         0.0949040         0.0409456    
      1.00000           1.54000          0.192874         0.0208677    
      1.54000           2.40000          0.204343         0.0193696    
      2.40000           4.80000          0.189400         0.0167181    
      4.80000           10.0000          0.190091         0.0266241