Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 15°C. We apply continuously 186°C heat to the field 5x4
What is the temperature (rounded to whole numbers) in the field 0x4 after 71 iterations according to the Gauss-Seidel iteration

Field in the beginning

15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515
15151515151515151515

Field after 4 iterations (rounded after 4th iteration)

2445566542
46781216161284
4791529453725157
5813306711878452411
591946118304129623114
51018397913089532913
591628476454382311
58131928353225178
3691216191915115
2346899753

Temperature in field 0x4 after 71 iterations: