Dear Editor,

We thank the editors for their helpful comments and respond to each of the items in our resubmission. Point-by-point responses (in normal font) to Editor’s comments (in italics) are provided and identified in the revised manuscript by blue highlights.

Editorial comments:

The editor has formatted the manuscript to match the journal's style. Please retain.

We have not changed the formatting in the manuscript.

Please address minor specific comments marked in the manuscript.

We have addressed all the minor specific comments marked in the manuscript. They are highlighted in blue.

Once done please ensure that the highlighted section is no more than 2.75 pages. Some of the shorter steps can be combined.

We have combined the shorter steps, and the (yellow) highlighted section is just at 2.75 pages.

We hope the revisions are sufficient for acceptance. If not, we are happy to make further revisions to make it suitable for publication.

Regards,

Scot Liu