Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 11°C. We apply continuously 80°C heat to the field 9x8
What is the temperature (rounded to whole numbers) in the field 5x1 after 143 iterations according to the Gauss-Seidel iteration

Field in the beginning

11111111111111111111
11111111111111111111
11111111111111111111
11111111111111111111
11111111111111111111
11111111111111111111
11111111111111111111
11111111111111111111
11111111111111111111
11111111111111111111

Field after 4 iterations (rounded after 4th iteration)

2334444321
3456676642
3578888763
4689999863
4689101010974
4789101010986
4689101010111414
36789910152637
246677101943108
1233446112132

Temperature in field 5x1 after 143 iterations: