Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 8°C. We apply continuously 87°C heat to the field 2x0
What is the temperature (rounded to whole numbers) in the field 3x7 after 51 iterations according to the Gauss-Seidel iteration

Field in the beginning

8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888

Field after 4 iterations (rounded after 4th iteration)

1138118411685321
1128503218117542
817252115119752
511151412109753
4810111098753
3689998753
3578888753
2466777642
2345555432
1222333221

Temperature in field 3x7 after 51 iterations: