# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0129889         0.0169564    
     0.460000          0.700000              -NaN              -NaN    
     0.700000           1.00000              -NaN              -NaN    
      1.00000           1.54000         0.0203685         0.0141665    
      1.54000           2.40000         0.0189963        0.00733260    
      2.40000           4.80000         0.0208446        0.00373203    
      4.80000           10.0000         0.0180089        0.00301219