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 85°C heat to the field 4x1
What is the temperature (rounded to whole numbers) in the field 6x0 after 70 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)

3613284931181173
5112558142633320126
613244467493322147
713213139352822157
713182428272420147
712172023232219147
712161820202017137
611141617171715116
5810121313121184
2456776542

Temperature in field 6x0 after 70 iterations: