Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 15°C. We apply continuously 137°C heat to the field 9x1
What is the temperature (rounded to whole numbers) in the field 7x9 after 40 iterations according to the Gauss-Seidel iteration

Field in the beginning

15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515

Field after 4 iterations (rounded after 4th iteration)

2445557163454
467899143072184
47911111216274764
581112131316212726
591113131415171713
59111314141515138
59111313141413116
5810111212121184
3689999863
2344555431

Temperature in field 7x9 after 40 iterations: