[NTG-context] sources of http://www.pragma-ade.com/general/manuals/style.pdf

Hello, I am a beginner with Context, and would like to know if there is a way to get the sources of the following document : http://www.pragma-ade.com/general/manuals/style.pdf I am trying to adapt the style I use with Latex (that is to say : http://mirrors.ctan.org/macros/latex/contrib/classicthesis/ClassicThesis.pdf), and this document has some features which might be useful for it. Moreover I don't know how to make the command width=66\averagecharacterwidth work, if I see the sources I may be successful in trying to make it work. Sincerely -- Alexandre KRISPIN