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 80°C heat to the field 7x1
What is the temperature (rounded to whole numbers) in the field 4x5 after 53 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)

356681427462712
5810111526561335521
6101314182643624119
6111416192431362814
7121517192225262011
712151719202121169
712151718191918147
610131516171715116
5810111213121184
2456676542

Temperature in field 4x5 after 53 iterations: