# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000         0.0358691         0.0114869    
      1.00000           1.54000         0.0130551         0.0242637    
      1.54000           2.40000         0.0305255         0.0304965    
      2.40000           4.80000         0.0692956         0.0249274    
      4.80000           10.0000         0.0592160         0.0231488