# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000              -NaN              -NaN    
     0.460000          0.700000         0.0222579         0.0307566    
     0.700000           1.00000         0.0640919         0.0218778    
      1.00000           1.54000         0.0307387         0.0149817    
      1.54000           2.40000         0.0288991         0.0123408    
      2.40000           4.80000              -NaN              -NaN    
      4.80000           10.0000         0.0377467         0.0127040