Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 12°C. We apply continuously 99°C heat to the field 3x5
What is the temperature (rounded to whole numbers) in the field 5x8 after 120 iterations according to the Gauss-Seidel iteration

Field in the beginning

12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212
12121212121212121212

Field after 4 iterations (rounded after 4th iteration)

2334444431
3567777652
36912131210963
4918272418141184
61638664629191394
8256516573382315105
821447251332215105
61426363124171384
491419181512963
2478876531

Temperature in field 5x8 after 120 iterations: