Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 13°C. We apply continuously 126°C heat to the field 3x7
What is the temperature (rounded to whole numbers) in the field 6x6 after 87 iterations according to the Gauss-Seidel iteration

Field in the beginning

13131313131313131313
13131313131313131313
13131313131313131313
13131313131313131313
13131313131313131313
13131313131313131313
13131313131313131313
13131313131313131313
13131313131313131313
13131313131313131313

Field after 4 iterations (rounded after 4th iteration)

2344444432
3567888753
4689101010973
479111212111074
4812161615131184
41122343023171395
620468256352315105
9298020789452616105
82350855734211384
4122333271811742

Temperature in field 6x6 after 87 iterations: