Let me send this message again, with a very small copy of the image attached.
I wrote: > Minute 41. T2 begins falling much faster. > This is a little hard to see. Look carefully. The slope of T2 changes a lot. At face value, that does indicate there is a source of heat in the cell which cuts off when the slope increases. I am not saying this is definitive. Let me illustrate this with a small image. Slope 1 is shown with a green line, (and marked "1"). Slope 2 is shown with a red line. - Jed
