Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 29°C. We apply continuously 79°C heat to the field 0x3
What is the temperature (rounded to whole numbers) in the field 6x4 after 142 iterations according to the Gauss-Seidel iteration

Field in the beginning

29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929
29292929292929292929

Field after 4 iterations (rounded after 4th iteration)

691010101010973
1721201918181715116
4237312624232220158
11558393128272522179
4542363229282724189
22303130292927241810
1423262828282724189
1118222424252421158
712161718191815116
468910109863

Temperature in field 6x4 after 142 iterations: