Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 19°C. We apply continuously 144°C heat to the field 0x3
What is the temperature (rounded to whole numbers) in the field 5x5 after 85 iterations according to the Gauss-Seidel iteration

Field in the beginning

19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919
19191919191919191919

Field after 4 iterations (rounded after 4th iteration)

7998776642
232420161412121084
6651342419171513105
19887473023191715116
7057402923201816126
2934302622201916126
1522232220191816126
915171717171614105
6912121313121074
3566776542

Temperature in field 5x5 after 85 iterations: