Dear Christopher,

Thanks for this new version of the manuscript and your reply to the 3 reviews. All three being very positive, I am happy to accept your paper fro publication in The Cryosphere. I have however noticed few minor errors that should be corrected before publication.

Thanks for having choosing The Cryosphere to publish this very nice piece of work!
Regards,
Olivier Gagliardini

- page 5, line 27 (on the version attached to the reply to reviews): don't understand the 'which cannot' in the brackets.

- page 8, line 6 (and elsewhere): table 1 -> Table 1

- page 8, line 12: Fig. 5(b) should be Fig. 5a (and at 2 other places in this page)

- page 9, lines 4-7: the text seems in contradiction with Fig. 6 on which I can only see normal calculation using the two first neighbours? There is no illustration showing a calculation using more distant neighbours, as seems to be suggested by this sentence?

- page 11, Results: check that the numbering of figures follows their order of appearance. Seems that it is not respected here.