# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0620875         0.0277973    
     0.460000          0.700000         0.0517796         0.0183062    
     0.700000           1.00000         0.0279215         0.0198665    
      1.00000           1.54000         0.0852388         0.0177126    
      1.54000           2.40000         0.0483473         0.0492622    
      2.40000           4.80000          0.131469         0.0369346    
      4.80000           10.0000         0.0607578         0.0272644