Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 18°C. We apply continuously 99°C heat to the field 1x7
What is the temperature (rounded to whole numbers) in the field 5x4 after 127 iterations according to the Gauss-Seidel iteration

Field in the beginning

18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818

Field after 4 iterations (rounded after 4th iteration)

3456666542
47910101110974
5911131314131295
610131515161514105
814171817171615116
1528272421191715116
3165483325201815116
54162734026201714105
326547312116131074
142522161197542

Temperature in field 5x4 after 127 iterations: