I haven't checked, but I bet none of them give actual coefficients. There seems to be a conspiracy of silence about this, and reading the technical agreement we've got with our supplier, I can't break it. None of the SAE papers I've read (for example) give actual coefficients. Sorry.
On the other hand, the curves generated by a FlatTrac machine are available on the web (I found them in 10 minutes of googling), and the actual equations are known, so it shouldn't take an enterprising person too long to devise a curve fitting algorithm to generate coefficients.
Of course, one problem is that you have to decide which Magic formula you are using - I've come across at least 5 variants. Cheers
Greg Locock