Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 25°C. We apply continuously 175°C heat to the field 2x8
What is the temperature (rounded to whole numbers) in the field 5x3 after 87 iterations according to the Gauss-Seidel iteration

Field in the beginning

25252525252525252525
25252525252525252525
25252525252525252525
25252525252525252525
25252525252525252525
25252525252525252525
25252525252525252525
25252525252525252525
25252525252525252525
25252525252525252525

Field after 4 iterations (rounded after 4th iteration)

3678888863
610121415151513105
712161819191917137
814182021212119147
815192223232320158
818262827262421168
1231504637302622168
23641148051352721147
3410528211959342317115
21559963352113963

Temperature in field 5x3 after 87 iterations: