# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0531890        0.00493209    
     0.460000          0.700000         0.0467436        0.00445511    
     0.700000           1.00000         0.0855506        0.00659007    
      1.00000           1.54000         0.0684205        0.00595825    
      1.54000           2.40000         0.0595505        0.00753972    
      2.40000           4.80000         0.0468977        0.00949879    
      4.80000           10.0000         0.0409991         0.0149130