Dear authors,
I had to take over Amaelle Landais who is presently doing field work in Antarctica and has no correct access to her emails, and moreover to CP system. Anyhow, the four reviewers find interests in your paper but show unanimity to require major revision of the original manuscript. Therefore, I am following their advice and invite you to revised your manuscript accordingly so that they could check if they find your revision accurate and corresponding to their comments or not.
Thank you for Chosing Climate of the Past as the plateform to present your results.
I look forward to reading from you
All the very best
denis-didier Rousseau
CP co-editor in chief

Dear James,
First of all I apologize for the delay in getting the forth review but I sincerely wanted to get this comment before deciding.
All reviewers indicate that you have made the necessary efforts to reply point by point all their comments, doing it in a very detailed way. You did consider all reviewers' proposals to improve your manuscript especially regarding its reorganization. The inclusion of tables for the new data and source of uncertainties is strongly appreciated as it eases the readability of the manuscript. The reviewers also appreciated your efforts in justifying the chosen tie-points for the gas and ice ages scales of the different cores in the supplementary material attached to the article. The new chronologies present now justified uncertainty estimates, which strengthen their interpretation. There are still two minor points that reviewer 4 would like to be corrected leading me to accept your revised manuscript after these technical corrections:
1) P13L19. Insert "modeled" before "firn density profile".
2) P13L21. Please provide the reason you chose the 3 m as the lock-in zone thickness. For the extremely low accumulation rate site, even 3 m sounds rather high (consider that modern Dome C and Dome Fuji with ~100-m firn thickness does not have LIZ of more than 3 m or so).

Thank you, once more for choosing Climate of the Past to publish your interesting results and I look forward to read new submission from your group

All the very best

denis-didier Rousseau
(Climate of the Past co-editor in chief)