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 134°C heat to the field 8x3
What is the temperature (rounded to whole numbers) in the field 4x1 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)

35667778107
581011121215233120
6101314151728528444
61114161723419021877
7121517182337639249
7121517192229404628
7121517182024272716
6101315161719191710
58101112131313106
2456677653

Temperature in field 4x1 after 139 iterations: