Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 8°C. We apply continuously 149°C heat to the field 6x1
What is the temperature (rounded to whole numbers) in the field 6x2 after 87 iterations according to the Gauss-Seidel iteration

Field in the beginning

8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888
8888888888

Field after 4 iterations (rounded after 4th iteration)

122515417746229
235103187234934016
24611275898643515
34610193446382412
356913202522168
356810131514116
3567810111084
2456788763
2345555542
1222333221

Temperature in field 6x2 after 87 iterations: