# 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        0.00202011         0.0246778    
      1.00000           1.54000              -NaN              -NaN    
      1.54000           2.40000         0.0300196         0.0190238    
      2.40000           4.80000         0.0223366        0.00995565    
      4.80000           10.0000         0.0251195        0.00459654