[Clascomment] OPT-IN:First measurement of the helicity asymmetry E in eta photoproduction on the proton

[Kijun Park]

Dear Authors,

This has an impressive result and great work ! Congratulation !
I have couple minor things authors may consider
(1) Fig.1, 
- It might be better to have tag a), b) and c) instead of left, middle, right.
- It should have a "(Color online)" in caption.
- On the left plot, just curious which one is + or - 
- I am confused with middle plot due to the factor of 2 statistical difference from left (I guess this is plot with the combined helicity states)
(2) I count a word "here" seven times...

Sincerely,
Kijun