Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 28°C. We apply continuously 183°C heat to the field 5x8
What is the temperature (rounded to whole numbers) in the field 5x4 after 63 iterations according to the Gauss-Seidel iteration

Field in the beginning

28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828

Field after 4 iterations (rounded after 4th iteration)

47899109863
711141516171615116
814182021212119147
915202223242421168
916212325262623179
10172124283433282010
9162128435951382512
81522397612686523014
6122148118299126613013
371330621066736188

Temperature in field 5x4 after 63 iterations: