Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 7°C. We apply continuously 195°C heat to the field 4x9
What is the temperature (rounded to whole numbers) in the field 3x5 after 84 iterations according to the Gauss-Seidel iteration

Field in the beginning

7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777
7777777777

Field after 4 iterations (rounded after 4th iteration)

1222222221
2334444431
2345555542
2456666542
2456666642
2456787652
2459141311853
249233831201273
26205410161311683
27278426389331462

Temperature in field 3x5 after 84 iterations: