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 72°C heat to the field 3x7
What is the temperature (rounded to whole numbers) in the field 6x8 after 75 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
611131516171614116
611151920191816126
613212927242117126
718355742312318136
9235312760352417126
71735554027191394
491622191410752

Temperature in field 6x8 after 75 iterations: