Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 20°C. We apply continuously 176°C heat to the field 8x7
What is the temperature (rounded to whole numbers) in the field 7x6 after 139 iterations according to the Gauss-Seidel iteration

Field in the beginning

20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020
20202020202020202020

Field after 4 iterations (rounded after 4th iteration)

3566777652
5810111212121084
610131415151513105
611141617171715127
7121517181818191912
7121517181923334427
71215171821356710957
610131517244811328198
5810111319377111158
245671119324225

Temperature in field 7x6 after 139 iterations: