Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 18°C. We apply continuously 84°C heat to the field 4x6
What is the temperature (rounded to whole numbers) in the field 5x2 after 59 iterations according to the Gauss-Seidel iteration

Field in the beginning

18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818

Field after 4 iterations (rounded after 4th iteration)

3456666542
47910101110974
5911131414141295
610131618191715116
610152331282318136
612224064463222147
6142962147693925157
613244367493322147
49162533292216105
25812151411853

Temperature in field 5x2 after 59 iterations: