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 79°C heat to the field 8x3
What is the temperature (rounded to whole numbers) in the field 0x9 after 51 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)

1222222353
2334446111711
23455713284725
245669204912644
24567917335227
24567913202415
2456681012138
2455667874
2344455542
1122222221

Temperature in field 0x9 after 51 iterations: