Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 1°C. We apply continuously 148°C heat to the field 1x7
What is the temperature (rounded to whole numbers) in the field 8x8 after 90 iterations according to the Gauss-Seidel iteration

Field in the beginning

1111111111
1111111111
1111111111
1111111111
1111111111
1111111111
1111111111
1111111111
1111111111
1111111111

Field after 4 iterations (rounded after 4th iteration)

0000000000
0001111100
0011111110
0111111110
3764321110
13272113742110
388252271373210
7422891401894210
438857311684210
18322616952110

Temperature in field 8x8 after 90 iterations: