Dear Fabien,

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 and interesting comments from the reviewers and your also thorough and interesting response to them. I have learnt a lot from your original manuscript and the discussion and I am looking forward to read the updated manuscript.

At this point I have to list the corrections or revisions that I would like to see in the new version of the manuscript. 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 make great suggestions to improve the clarity and to make the paper more approachable to the glaciological community. Also both of them raise concerns about the twin experiment and its analysis. I can see through your response to the reviewers that all of them have been dealt by you already by revising the text and incorporating new experiments and figures. So, let’s have a look to that updated version of the manuscript.

I agree with the reviewers that the manuscript has improved considerably and is ready for publication. The reviewers have listed a few suggestions to improve the manuscript. I would like the author to consider them before publication.

I would like to highlight here the excellent response from the author to the reviewer's comments, and thank the insightful and detailed comments from the reviewers.