# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000         0.0257625         0.0733269    
     0.700000           1.00000         0.0422562         0.0381976    
      1.00000           1.54000              -NaN              -NaN    
      1.54000           2.40000         0.0280796         0.0188224    
      2.40000           4.80000         0.0274098         0.0181566    
      4.80000           10.0000              -NaN              -NaN