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 74°C heat to the field 2x7
What is the temperature (rounded to whole numbers) in the field 8x1 after 39 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
5912131414141295
510151616161513105
717252421181614105
1231543928211714105
1750126583322171395
133253382518131073
715211813107542

Temperature in field 8x1 after 39 iterations: