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 70°C heat to the field 4x4
What is the temperature (rounded to whole numbers) in the field 9x6 after 121 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)

2334444331
3457998752
359142118141073
4714294934221494
492149119542917105
49183454382517105
48142229252014105
3710141717141184
3579101010853
1234555431

Temperature in field 9x6 after 121 iterations: