Here are the bare essentials
http://www.dawalker.staff.shef.ac.uk/daw/stpictures.pdf
I would be very happy to provide anyone with an unexpurgated version or a
PowerPoint presentation that deals in more detail with the underlying
science if you would care to contact me by Email
>From David Walker, FRS., Emeritus Professor of Photosynthesis, University of
Sheffield, UK.