# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000        0.00370203        0.00366615    
     0.460000          0.700000        0.00596631        0.00277377    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000        0.00250766        0.00523411    
      1.54000           2.40000              -NaN              -NaN    
      2.40000           4.80000         0.0147194        0.00404355    
      4.80000           10.0000              -NaN              -NaN