# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0159344        0.00984524    
     0.460000          0.700000        0.00453261        0.00946703    
     0.700000           1.00000        0.00250730        0.00806959    
      1.00000           2.40000        0.00447633        0.00234396    
      2.40000           4.80000        0.00303170        0.00525866    
      4.80000           10.0000        0.00552425        0.00627699