Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 31°C. We apply continuously 111°C heat to the field 3x3
What is the temperature (rounded to whole numbers) in the field 2x9 after 99 iterations according to the Gauss-Seidel iteration

Field in the beginning

31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131

Field after 4 iterations (rounded after 4th iteration)

4711141413121074
715263734282318137
1126528462443325179
143784198955739292010
14346295725240312211
13284457524437302211
12233339403734282010
1018252931302824179
713172022222017126
47910111110963

Temperature in field 2x9 after 99 iterations: