# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.271709        0.00827553    
     0.460000          0.700000          0.289644        0.00862636    
     0.700000           1.00000          0.260758         0.0129042    
      1.00000           1.54000          0.310603         0.0201026    
      1.54000           2.40000          0.361416         0.0334031    
      2.40000           4.80000          0.394020         0.0349678    
      4.80000           10.0000          0.298157         0.0576490