Since people here were asking numerical questions, a quantitative analysis seemed to be called for. I know all that was a bit long, but I figured that explaining how I arrived at my estimates would serve two purposes: (1) so that I wouldn't just be pulling numbers out of the air (which tends to lead to unnecessary arguments) and to see what might be learned from the photos and (2) so that anyone else could see where I got my numbers and could see what they came up with by using other values. Anyway, I'm done for now...