Dear Authors,

I have just read the reviewers’ comments to your manuscript and your response to them. First of all I would like to thank the thorough comments from the reviewers and your detailed response to them.

At this point it is my role to list the corrections or revisions that I would like to see in the revised version of the paper. This is a trivial job with such an excellent reviewers’ comments as I simply ask you to take their comments into careful consideration. Both of them agree that the contents of the paper are excellent and worth of publication but they also agree that it needs serious rewriting. I will not accept a manuscript where it is not clear what is a hypothesis, a theory or an interpretation.

I can see that you have been proactive in uploading a revised version of the paper. I have read this revised version of the manuscript and it looks to me that the paper is much improved. In any case, I would like to give an opportunity to the reviewers to check the revised paper.

I agree with both reviewers that the manuscript has improved greatly. Both reviewers have listed a few specific suggestions to improve the manuscript further, I am asking you to consider them for the next, and hopefully last, version of the document.

I would like to thank the reviewers again, for a exceptionally helpful review and making my job trivial, and the authors for addressing most of the comments and, also, making my job trivial.

Carlos Martin