# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00306465         0.0246422    
     0.460000          0.700000         0.0119976         0.0143085    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000         0.0206033         0.0134699    
      1.54000           2.40000         0.0203034        0.00689367    
      2.40000           4.80000              -NaN              -NaN    
      4.80000           10.0000         0.0100268        0.00414568