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 122°C heat to the field 2x6
What is the temperature (rounded to whole numbers) in the field 5x1 after 148 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
2356665542
261010987642
516272316129752
13407449281711853
237219682392113853
18468154321912852
1024363021149642
51014131075321

Temperature in field 5x1 after 148 iterations: