# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000       0.000597225         0.0265895    
     0.700000           1.00000         0.0185743         0.0130971    
      1.00000           1.54000         0.0259060         0.0105165    
      1.54000           2.40000         0.0269859         0.0152335    
      2.40000           4.80000              -NaN              -NaN    
      4.80000           10.0000              -NaN              -NaN