I requested reports on your revised paper from the two of the three referees who were less positive in their verdicts on the original paper. Both referees now see the paper as significantly improved and suitable for publication subject to minor revisions. Please can you consider the referees comments, make revisions as you think appropriate and provide brief responses. I then expect to accept the paper without needing further consultation with the referees.

You have address the furthered minor comments of the referees and, whilst, as with all papers, I am sure that further minor clarifications could be made, your paper is agreed by all to be very interesting and I am pleased to accept it at this stage for publication in ACP.

I noticed one point where a minor technical correction needs to be made:

(abstract) l19: 'to simulate weakening an enhancement' -- 'an' is not correct -- this would be clearest as 'to simulate either a weakening or an enhancement'