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 158°C heat to the field 0x1
What is the temperature (rounded to whole numbers) in the field 1x9 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)

634325151087652
2138944261815131184
7559402821181614105
3135312622201816126
1623242321201917126
1017202120201917137
814171919191916126
711141617171614115
5810121213121184
2456776542

Temperature in field 1x9 after 70 iterations: