Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 17°C. We apply continuously 150°C heat to the field 4x0
What is the temperature (rounded to whole numbers) in the field 4x2 after 73 iterations according to the Gauss-Seidel iteration

Field in the beginning

17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717

Field after 4 iterations (rounded after 4th iteration)

39246920672291473
512265389583320115
512223547402920136
611182530282419137
611151922222017126
610141719191816126
610131517171715116
5912131415141395
47910111111973
2345665532

Temperature in field 4x2 after 73 iterations: