Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 19°C. We apply continuously 155°C heat to the field 5x2
What is the temperature (rounded to whole numbers) in the field 9x7 after 57 iterations according to the Gauss-Seidel iteration

Field in the beginning

19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919

Field after 4 iterations (rounded after 4th iteration)

3451020322617105
48122556986537209
5101841101257111542812
61119377011378482713
6121829455951372311
6121723313634281910
611151923262522168
610131618191917126
4710111313131184
2456677642

Temperature in field 9x7 after 57 iterations: