Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 36°C. We apply continuously 198°C heat to the field 1x6
What is the temperature (rounded to whole numbers) in the field 3x3 after 86 iterations according to the Gauss-Seidel iteration

Field in the beginning

36363636363636363636
36363636363636363636
36363636363636363636
36363636363636363636
36363636363636363636
36363636363636363636
36363636363636363636
36363636363636363636
36363636363636363636
36363636363636363636

Field after 4 iterations (rounded after 4th iteration)

5810111212121184
814182021212119147
1019242627282724189
15283333333231272111
29565446403734302212
631309666504136312312
11032614983564437312312
6813710269504034282010
3563594737302621147
152627231916131174

Temperature in field 3x3 after 86 iterations: