# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0103334         0.0122929    
     0.460000           1.54000        0.00574947        0.00840293    
      1.54000           2.40000         0.0522091         0.0100590    
      2.40000           4.80000         0.0844079        0.00543432    
      4.80000           10.0000         0.0696683        0.00507555