Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 21°C. We apply continuously 145°C heat to the field 5x7
What is the temperature (rounded to whole numbers) in the field 5x1 after 57 iterations according to the Gauss-Seidel iteration

Field in the beginning

21212121212121212121
21212121212121212121
21212121212121212121
21212121212121212121
21212121212121212121
21212121212121212121
21212121212121212121
21212121212121212121
21212121212121212121
21212121212121212121

Field after 4 iterations (rounded after 4th iteration)

3567777652
5810121212121184
610131516161614116
712151718191816126
712161821252421158
712162133464029199
71218326110170432512
612204299244107542812
5916326310270412310
2591729403321126

Temperature in field 5x1 after 57 iterations: