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 194°C heat to the field 8x9
What is the temperature (rounded to whole numbers) in the field 9x4 after 78 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
2456666542
3466777652
3567777653
3567777764
356777710129
24566711233622
23455822539749
122238278425877

Temperature in field 9x4 after 78 iterations: