# 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         0.0122097        0.00532668    
      1.00000           1.54000         0.0108715        0.00591719    
      1.54000           2.40000        0.00641663        0.00677973    
      2.40000           4.80000         0.0550999        0.00678602    
      4.80000           10.0000              -NaN              -NaN