Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 20°C. We apply continuously 162°C heat to the field 1x4
What is the temperature (rounded to whole numbers) in the field 5x3 after 68 iterations according to the Gauss-Seidel iteration

Field in the beginning

20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020

Field after 4 iterations (rounded after 4th iteration)

3577777652
71416151413121184
2039352722181614105
48100704531232016126
872611146037272218137
54109795236272218137
2952493930252118137
1628302724211916116
91518181715141184
4789887642

Temperature in field 5x3 after 68 iterations: