# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0212580        0.00415417    
     0.460000           1.54000         0.0118697        0.00285619    
      1.54000           2.40000         0.0179408        0.00756354    
      2.40000           4.80000         0.0320324        0.00720371    
      4.80000           10.0000         0.0367676         0.0113073