Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 40°C. We apply continuously 103°C heat to the field 8x5
What is the temperature (rounded to whole numbers) in the field 5x8 after 144 iterations according to the Gauss-Seidel iteration

Field in the beginning

40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040

Field after 4 iterations (rounded after 4th iteration)

6912131314131295
916202223242321169
12202528303030282414
13222832343436404124
13233034363846628143
142430343742559118368
13233034364151688645
12212730333641474727
9162023252629292615
58111213141414127

Temperature in field 5x8 after 144 iterations: