This shows the process on a perspective I never thought of.
The way I interpret this:
there are two ways of heat source/ heat spreading
1)the heat starts right in the middle of the core and expands (thus forming circleshaped isothermes)
2)the core is the hottest spot (shape of rectangular) and around the core circleshaped isothermes
What I see here is the combination of those two. (something in between a circle and a rectangular, because the most heat comes out of the center of the core, but also "some" (but less) heat comes of the other part of the (rectangular) core)
right?
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