# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0283135         0.0150421    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000              -NaN              -NaN    
      1.54000           2.40000         0.0410053         0.0147760    
      2.40000           4.80000         0.0538970         0.0171633    
      4.80000           10.0000              -NaN              -NaN