Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 26°C. We apply continuously 158°C heat to the field 8x8
What is the temperature (rounded to whole numbers) in the field 6x0 after 129 iterations according to the Gauss-Seidel iteration

Field in the beginning

26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626

Field after 4 iterations (rounded after 4th iteration)

4688999863
610131415151514105
813161819201917137
814182122222220158
915192223242321169
9152022242424242314
9151922232427364426
81417202124366410052
610131516234410024986
357891426528643

Temperature in field 6x0 after 129 iterations: