# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00964145        0.00347726    
     0.460000          0.700000        0.00657261        0.00285547    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000        0.00698621        0.00261566    
      1.54000           2.40000              -NaN              -NaN    
      2.40000           4.80000         0.0160013        0.00338449    
      4.80000           10.0000              -NaN              -NaN