Dear Martin, I have a nearly complete draft of our MAP Z-R (now also Z-W) paper almost ready. I ran out of time today as I found some errors in my calculations. I am attaching what I have so you can see where things are. Please read sections 1-3 and the Appendix. I am not sure I have correctly stated how the calculations were done. Also note the sections with $ where we need to check, correct, fill in or deal with. If you can type Table 1 into Word, I can include it in the next draft. We also likely need better section names. I am still working on sections 4 and 5 so please ignore them. I will hopefully have the revisions of these with their accompanying revised figures to you tomorrow. I think I have replacements for the histograms of weighted a and frequency of a so dont worry about those. I hope you had a nice holiday. Sincerely, Sandra