Out of curiosity, do you know where is described how to find the A and C(?) values?
If you use the search button you will probably finder over 50 pages dedicated to calculation of the A and C values. The search function is one of the strengths of ET, it actually works pretty well. It's not a one line answer which is why I'm not just telling you, you have to read through all the discussions about it to understand it.
you have indirectly answered my question to some degree 
i have read the book 2 times and watched the seminars the mark fisher did