Hi Gang,

   Thank you for the updated version.
   Please find my additional comments below:
   Paper: page 3:
   =E2=80=A6 a weak energy dependency above 19.6 GeV. =46rom 19.6 to 7.7 
GeV, (gammaOS =E2=88=92 gammaSS) tends to diminish, which is   
   more prominent in peripheral collisions, though the statisti- cal 
errors are large for 7.7 GeV.
   This may be explained by the probable domination of hadronic 
interactions over partonic ones in peripheral collisions   at low 
energies.

   The decreasing trend is not visible between 19.6 and 11.5 GeV. Also 
19.6 - 27 GeV seems showing the decreasing trend for all three 
centrality bins.
   We would be careful about the discussion in the text.

   Analysis note: 2.5 efficiency, "The efficiency for 62.4 GeV Au+Au 
(run4) was interpolated from the known efficiency for 200 GeV (run4)."
   I would be good to add more details on the interpolation. (relevant 
figs and procedures.)

   With these addressed, I sign off.

thanks,

Shusu
==========================================================================
Hi, Shusu

Thanks for further comments!

In the middle and lower panels of Fig 3, the 19 GeV points
do look like the highest points among all energies, though
we can say 11.5 GeV points may be somewhat consistent
with 19.6 GeV within the errors.
For each centrality, 11.5 GeV is lower than 19.6 GeV.
So there's a systematic trend.
I hope the future GPC and collaboration review will
settle it down on how to describe these data points.

For the technical note, we've added the following explanation:

The tracking efficiency for run4 200 GeV was obtained from embedding
data by previous STAR collaborators for PID analyses. Assuming for the
same year the detector condition and the tracking algorithm are not
significantly changed, the tracking efficiency will be a function of
occupancy. Thus we can interpolate the efficiency according to the
multiplicity from 200 GeV to 62.4 GeV.

Thanks

Gang