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 174°C heat to the field 9x6
What is the temperature (rounded to whole numbers) in the field 6x4 after 99 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)

1223333221
2344555432
2456666543
3466777678
3567777112025
35677710224976
356778143691235
24566713285579
2345569172729
122233581110

Temperature in field 6x4 after 99 iterations: