# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00810725        0.00629152    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000         0.0155834        0.00468969    
      1.00000           1.54000              -NaN              -NaN    
      1.54000           2.40000              -NaN              -NaN    
      2.40000           4.80000         0.0119857         0.0102826    
      4.80000           10.0000         0.0196198         0.0123189