Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 16°C. We apply continuously 78°C heat to the field 7x8
What is the temperature (rounded to whole numbers) in the field 3x2 after 140 iterations according to the Gauss-Seidel iteration

Field in the beginning

16161616161616161616
16161616161616161616
16161616161616161616
16161616161616161616
16161616161616161616
16161616161616161616
16161616161616161616
16161616161616161616
16161616161616161616
16161616161616161616

Field after 4 iterations (rounded after 4th iteration)

2455555542
4689999863
5810111212121184
5911131314131295
59121314151413105
59121415151616137
591213141722272111
581112142136553516
46891324531285220
234581428462712

Temperature in field 3x2 after 140 iterations: