Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 21°C. We apply continuously 85°C heat to the field 0x6
What is the temperature (rounded to whole numbers) in the field 6x6 after 109 iterations according to the Gauss-Seidel iteration

Field in the beginning

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21

Field after 4 iterations (rounded after 4th iteration)

3	5	6	7	7	7	7	6	5	2
5	8	10	12	12	12	12	11	8	4
6	11	14	15	16	16	16	14	11	6
9	14	17	18	18	18	18	16	12	6
18	22	22	21	20	20	19	17	13	7
43	37	29	24	22	21	20	18	13	7
121	57	35	27	23	21	20	17	13	7
44	38	29	24	21	19	18	15	11	6
18	21	20	17	16	15	13	11	8	4
7	10	10	9	8	8	7	6	4	2

Temperature in field 6x6 after 109 iterations:

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21

3	5	6	7	7	7	7	6	5	2
5	8	10	12	12	12	12	11	8	4
6	11	14	15	16	16	16	14	11	6
9	14	17	18	18	18	18	16	12	6
18	22	22	21	20	20	19	17	13	7
43	37	29	24	22	21	20	18	13	7
121	57	35	27	23	21	20	17	13	7
44	38	29	24	21	19	18	15	11	6
18	21	20	17	16	15	13	11	8	4
7	10	10	9	8	8	7	6	4	2

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21

3	5	6	7	7	7	7	6	5	2
5	8	10	12	12	12	12	11	8	4
6	11	14	15	16	16	16	14	11	6
9	14	17	18	18	18	18	16	12	6
18	22	22	21	20	20	19	17	13	7
43	37	29	24	22	21	20	18	13	7
121	57	35	27	23	21	20	17	13	7
44	38	29	24	21	19	18	15	11	6
18	21	20	17	16	15	13	11	8	4
7	10	10	9	8	8	7	6	4	2

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21

3	5	6	7	7	7	7	6	5	2
5	8	10	12	12	12	12	11	8	4
6	11	14	15	16	16	16	14	11	6
9	14	17	18	18	18	18	16	12	6
18	22	22	21	20	20	19	17	13	7
43	37	29	24	22	21	20	18	13	7
121	57	35	27	23	21	20	17	13	7
44	38	29	24	21	19	18	15	11	6
18	21	20	17	16	15	13	11	8	4
7	10	10	9	8	8	7	6	4	2