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 197°C heat to the field 8x7
What is the temperature (rounded to whole numbers) in the field 4x8 after 43 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
916202223242321168
12202528303030272011
13222832343434302413
13233034363636353219
14243034363741526036
132330343640559013270
12212730334168139324115
91620232532528813169
581112141827415030

Temperature in field 4x8 after 43 iterations: