The revised paper addresses the technical comments expressed in the initial reviews. There are several minor comments (described in the current referee reports) that needs to be addresses prior to publication. Most important, as noted by both referees the paper needs a careful proofreading for language improvement. After successful completion of these revisions (please pay particular attention to the proofreading), the paper can be accepted for publication.

Thank you for your work on improving the paper and addressing the recent comments by the referees. The paper is now accepted for publication in NPG. Thank you for choosing NPG as a venue for your work.