# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0222996        0.00658254    
     0.460000          0.700000        0.00240706        0.00923547    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000        0.00960839        0.00425351    
      1.54000           2.40000        0.00542590        0.00640199    
      2.40000           4.80000         0.0102630        0.00538327    
      4.80000           10.0000              -NaN              -NaN