# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.700000         0.0325527         0.0120971    
     0.700000           1.00000         0.0150103         0.0138387    
      1.00000           1.54000         0.0585950        0.00504642    
      1.54000           2.40000         0.0922875        0.00244751    
      2.40000           4.80000         0.0893570        0.00164949    
      4.80000           10.0000         0.0831325        0.00205486