Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 35°C. We apply continuously 63°C heat to the field 4x9
What is the temperature (rounded to whole numbers) in the field 9x1 after 66 iterations according to the Gauss-Seidel iteration

Field in the beginning

35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535

Field after 4 iterations (rounded after 4th iteration)

5810111212121184
814171920212018147
1017222526272623189
11192528293029262010
12202629313231282111
12212730323332292212
12202630343533292211
11182532393733271910
815233653403022157
4917379539211384

Temperature in field 9x1 after 66 iterations: