This is the very reason as to why it is important for our colleagues to speak up when the have useful information, or questions. Thereby, we learn so much more. I tried to find out more about the illustration but, obviously, I was not successful. <;^)
I make a great effort to provide as much as I can with each of my 'serious' posts. I, like all of us, do not have all of the answers. Many times information provided in a follow-up post or in a question triggers in me a new way to look at the situation. I become richer in my knowledge through such a process. The whole IS greater than the sum of its parts, eh.