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 126°C heat to the field 5x8
What is the temperature (rounded to whole numbers) in the field 9x4 after 85 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	10	13	15	16	16	16	14	11	6
7	12	15	17	18	18	18	16	12	6
7	12	16	18	19	20	19	17	13	7
7	12	16	18	21	25	24	21	15	8
7	12	16	21	31	42	37	27	18	9
6	11	16	28	54	88	61	37	21	10
5	9	16	34	82	207	88	43	21	9
2	5	10	21	43	74	46	25	13	6

Temperature in field 9x4 after 85 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	10	13	15	16	16	16	14	11	6
7	12	15	17	18	18	18	16	12	6
7	12	16	18	19	20	19	17	13	7
7	12	16	18	21	25	24	21	15	8
7	12	16	21	31	42	37	27	18	9
6	11	16	28	54	88	61	37	21	10
5	9	16	34	82	207	88	43	21	9
2	5	10	21	43	74	46	25	13	6

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	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	10	13	15	16	16	16	14	11	6
7	12	15	17	18	18	18	16	12	6
7	12	16	18	19	20	19	17	13	7
7	12	16	18	21	25	24	21	15	8
7	12	16	21	31	42	37	27	18	9
6	11	16	28	54	88	61	37	21	10
5	9	16	34	82	207	88	43	21	9
2	5	10	21	43	74	46	25	13	6

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	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	10	13	15	16	16	16	14	11	6
7	12	15	17	18	18	18	16	12	6
7	12	16	18	19	20	19	17	13	7
7	12	16	18	21	25	24	21	15	8
7	12	16	21	31	42	37	27	18	9
6	11	16	28	54	88	61	37	21	10
5	9	16	34	82	207	88	43	21	9
2	5	10	21	43	74	46	25	13	6