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 167°C heat to the field 5x9
What is the temperature (rounded to whole numbers) in the field 3x9 after 51 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
610131415151514105
610131516161615116
611141516181716126
610131519232219137
59121830433625157
47122553945933177
241027762298031135

Temperature in field 3x9 after 51 iterations: