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 102°C heat to the field 4x9
What is the temperature (rounded to whole numbers) in the field 7x7 after 58 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
712151718181816126
712161819191917137
712161820202018137
712161923232118137
611162534302419136
510193863432717115
37184914352231263

Temperature in field 7x7 after 58 iterations: