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 160°C heat to the field 1x2
What is the temperature (rounded to whole numbers) in the field 3x9 after 87 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)

17332821151211973
4799694430231916126
882601166340302521158
56112835741332824179
32575546383329251810
20343837343229251910
1424293130292824189
1018232526262421168
713161819191816116
468910109863

Temperature in field 3x9 after 87 iterations: