OPT-IN: The Beam-Target E asymmetry for vec gamma vec n -> pi- p in the Nâ resonance region

[Volker Burkert]

Congratulations to this well written and well motivated paper!

I have only a couple of minor comments:

1) Since this is the first measurement of its kind it would be appropriate to mention this not 
only in the abstract by also in the title, e.g. "First beam-target E asymmetry measurement ......". 

2) On page 4, both in Fig.4 caption and at the end of the first paragraph in left column the 
"energies' 1500, 1900 and 2200MeV are listed while they are are referring to the hadronic 
invariant mass "W" graphs of these values.  

3) The link to the CLAS Physics Data Base is given as reference for the data. I tried to look
 at the data but couldn't find them there. Please verify the data are posted before submitting the
letter. A referee may want to look at them. 

Good luck with the PRL submission!
Volker