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 121°C heat to the field 1x9
What is the temperature (rounded to whole numbers) in the field 3x9 after 54 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
611141617171715116
712151718181816126
712161819191817137
916192019191816126
1630292420191715115
316645282016131184
4816458251497642

Temperature in field 3x9 after 54 iterations: