# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000         0.0120666         0.0118619    
     0.700000           1.00000        0.00847660         0.0138873    
      1.00000           1.54000         0.0123962         0.0188257    
      1.54000           2.40000         0.0563868         0.0130921    
      2.40000           4.80000         0.0292015        0.00707439    
      4.80000           10.0000         0.0216838        0.00697123