Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 24°C. We apply continuously 65°C heat to the field 9x4
What is the temperature (rounded to whole numbers) in the field 4x9 after 30 iterations according to the Gauss-Seidel iteration

Field in the beginning

24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424

Field after 4 iterations (rounded after 4th iteration)

3678888753
610121314141413107
7121517181818181815
8131719202121243035
8141820212224304794
8141821222324283437
8141820222223242418
7131618192020201710
59121415151514116
3567888753

Temperature in field 4x9 after 30 iterations: