# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0153410        0.00364840    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000        0.00384292        0.00404604    
      1.00000           1.54000        0.00752810        0.00329709    
      1.54000           2.40000              -NaN              -NaN    
      2.40000           4.80000        0.00242086        0.00576781    
      4.80000           10.0000        0.00526763        0.00739059