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 185°C heat to the field 7x5
What is the temperature (rounded to whole numbers) in the field 3x3 after 57 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
2334444442
234555812106
245661024393015
2456924601106831
2457144011129511845
24571332711217735
2456102139554222
234471220252112
11223691095

Temperature in field 3x3 after 57 iterations: