Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 26°C. We apply continuously 161°C heat to the field 5x8
What is the temperature (rounded to whole numbers) in the field 2x0 after 73 iterations according to the Gauss-Seidel iteration

Field in the beginning

26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626

Field after 4 iterations (rounded after 4th iteration)

4688999863
610131415151514105
813161819201917137
814182122222220158
915192223242422168
9152022263130261810
9151926395346342211
81420356811277472712
6112043104264112542711
36122655945932167

Temperature in field 2x0 after 73 iterations: