[Clascomment] OPT-IN:First Measurement of Deeply Virtual Compton Scattering on the Neutron with Detection of the Active Neutron

[Sebastian Kuhn]

Nice work! 
I have one comment about the exclusivity cuts (184ff.): While I understand that you are space-limited preventing you from showing all those variables as plots, maybe you could be a bit more explicit in the text what cuts you chose (e.g., max. Delta-t or max Delta-phi).

My other comments are about the Figs. and their interpretation. One general comment: Depending on where you plan to submit this paper, and whether you are willing to pay rather steep color charges, you may have to add more descriptive legends/symbols not relying on color (and also add "[Color online]" to the captions).

Fig. 4: while the caption explains which variable you CHOSE to change across each separate row, the values given for ALL 3 vary from panel to panel, so that the x-variation in the 1st row is nearly as much as in the 2nd row. I understand that the low statistics may prevent you from "true 4-dimensional binning", but maybe you could limit the range in the variable that you are NOT varying in a given row so it doesn't change by quite as much? If that's impossible, at a minimum, indicate that the values you show for all 3 are (statistics-weighed, I presume) averages (also indicate using brackets <> in the figure itself).

Fig. 5: I find it striking that the very strong t-dependence in the VGG model is not at all visible in the data. Is this because in the model curves, you keep x and Q2 fixed and ONLY vary t? Given that those 3 seem strongly correlated (Fig. 4), would it be possible to account for this correlation when drawing the curves (i.e., while changing t, also change x and Q2 according to the observed correlation)?
Also, just out of curiosity: Is the strong Q2-dependence in the VGG curves due to the relative strength of BH vs. DVCS?

Fig. 6: Would it be possible to indicate (maybe with dashed outlines) the results from the same NN fits WITHOUT these new data? This may be more impressive than just describing the difference in words.

(BTW, why is there such a huge gap between line 313 and 314?)