# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.527041         0.0116584    
     0.460000          0.700000          0.512452         0.0119905    
     0.700000           1.00000          0.463470         0.0169931    
      1.00000           1.54000          0.512624         0.0187861    
      1.54000           2.40000          0.511091         0.0197574    
      2.40000           4.80000          0.303615         0.0208121    
      4.80000           10.0000          0.177884         0.0263065