Both reviewers highlight that the findings presented in this manuscript, although valuable, are heavily based on the paper by Rossi et al., on EPSL, (https://doi.org/10.1016/j.epsl.2018.10.007), not yet published no accepted at the time of the review.

Under this conditions it was difficult to proceed with the evaluation. To take a final decision, I decided to wait a few weeks, until the publication of the paper by Rossi et.

Now, the paper by Rossi et al. (to appear in 2019) is accepted on EPSL and is available on-line. In order to review again the manuscript, I technically propose a major revision. In this context, I kindly ask the referees to review again the manuscript.

I consider this paper of great value. I just highlight minor technical corrections regarding the numbering of the figures. Please check page 25 (Table 3 shold be table 1) and page 27 (figure 2 should be figure 1).