Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 23°C. We apply continuously 129°C heat to the field 8x7
What is the temperature (rounded to whole numbers) in the field 4x9 after 79 iterations according to the Gauss-Seidel iteration

Field in the beginning

23232323232323232323
23232323232323232323
23232323232323232323
23232323232323232323
23232323232323232323
23232323232323232323
23232323232323232323
23232323232323232323
23232323232323232323
23232323232323232323

Field after 4 iterations (rounded after 4th iteration)

3577888753
5911131314131295
711141617171715126
713161819201917148
8131719202121211912
8141720212224313722
8131719212333568545
71215171924428921074
591213151932568544
356781016263219

Temperature in field 4x9 after 79 iterations: