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 155°C heat to the field 6x6
What is the temperature (rounded to whole numbers) in the field 4x7 after 109 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
61012131414141395
712151718181817137
813171920232624189
8141820253749412714
81418233768109744320
8141826491092641165624
71317244174116794621
591318274356463014
357914202421147

Temperature in field 4x7 after 109 iterations: