# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0306870         0.0427379    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000          0.110867         0.0342240    
      1.54000           2.40000         0.0466672         0.0241591    
      2.40000           4.80000         0.0809287         0.0162692    
      4.80000           10.0000              -NaN              -NaN