# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0308451         0.0318429    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000         0.0136461        0.00551279    
      1.54000           2.40000         0.0153183        0.00373000    
      2.40000           4.80000              -NaN              -NaN    
      4.80000           10.0000        0.00255516        0.00968173