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 174°C heat to the field 4x7
What is the temperature (rounded to whole numbers) in the field 2x5 after 39 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)

3456666642
489111111111074
59121314141413105
611131517171715116
611141924242118137
611193349423223158
6143167115794930189
617441122871246234199
5143471119804828167
3818334637251594

Temperature in field 2x5 after 39 iterations: