Thanks for that link. My original sighting of the phenomena used the exact same graph, but made no attempt at being explanatory. I have since then, been searchi

Thanks for that link. My original sighting of the phenomena used the exact same graph, but made no attempt at being explanatory. I have since then, been searching, but failed to re-find a copy of that graph to stick into my files. Now, thanks you you, I have! Thanks!