Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 29°C. We apply continuously 63°C heat to the field 3x6
What is the temperature (rounded to whole numbers) in the field 8x2 after 144 iterations according to the Gauss-Seidel iteration

Field in the beginning

29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929

Field after 4 iterations (rounded after 4th iteration)

4789101010973
712141617171715116
814182122222219158
916212527262522179
1018283635322925189
11234060493932261910
122857123654434271910
1124426149383024178
817263331272218126
481215151412963

Temperature in field 8x2 after 144 iterations: