Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 7°C. We apply continuously 102°C heat to the field 8x1
What is the temperature (rounded to whole numbers) in the field 2x4 after 54 iterations according to the Gauss-Seidel iteration

Field in the beginning

7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777

Field after 4 iterations (rounded after 4th iteration)

12222411285126
233448225915754
23456919406433
24566914232918
24566811141510
24566781096
2456677764
2455666642
2344444432
1122222211

Temperature in field 2x4 after 54 iterations: