Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 22°C. We apply continuously 73°C heat to the field 6x4
What is the temperature (rounded to whole numbers) in the field 0x9 after 150 iterations according to the Gauss-Seidel iteration

Field in the beginning

22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222
22222222222222222222

Field after 4 iterations (rounded after 4th iteration)

3567778753
59111213141614105
611141518243025179
7121519254060422612
71317213361134633315
7131722304666482914
7131720263340342312
711151821242724179
59111315171715116
3467888753

Temperature in field 0x9 after 150 iterations: