# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0290644        0.00620959    
     0.460000          0.700000         0.0210674        0.00726733    
     0.700000           1.54000         0.0156575         0.0102711    
      1.54000           2.40000         0.0317926         0.0208805    
      2.40000           4.80000         0.0299777         0.0283891    
      4.80000           10.0000         0.0649388         0.0410262