Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 18°C. We apply continuously 164°C heat to the field 8x2
What is the temperature (rounded to whole numbers) in the field 5x4 after 89 iterations according to the Gauss-Seidel iteration

Field in the beginning

18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18

Field after 4 iterations (rounded after 4th iteration)

3	4	5	6	6	6	10	20	31	19
4	7	9	10	10	13	26	57	96	51
5	9	11	13	14	20	43	104	261	91
6	10	13	14	16	22	38	70	108	57
6	10	13	15	17	20	30	43	52	32
6	11	14	15	17	19	23	28	29	18
6	10	13	15	16	18	19	21	18	11
5	9	12	14	15	15	16	15	13	7
4	7	9	10	11	11	11	11	8	4
2	4	5	5	6	6	6	5	4	2

Temperature in field 5x4 after 89 iterations:

18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18

3	4	5	6	6	6	10	20	31	19
4	7	9	10	10	13	26	57	96	51
5	9	11	13	14	20	43	104	261	91
6	10	13	14	16	22	38	70	108	57
6	10	13	15	17	20	30	43	52	32
6	11	14	15	17	19	23	28	29	18
6	10	13	15	16	18	19	21	18	11
5	9	12	14	15	15	16	15	13	7
4	7	9	10	11	11	11	11	8	4
2	4	5	5	6	6	6	5	4	2

18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18

3	4	5	6	6	6	10	20	31	19
4	7	9	10	10	13	26	57	96	51
5	9	11	13	14	20	43	104	261	91
6	10	13	14	16	22	38	70	108	57
6	10	13	15	17	20	30	43	52	32
6	11	14	15	17	19	23	28	29	18
6	10	13	15	16	18	19	21	18	11
5	9	12	14	15	15	16	15	13	7
4	7	9	10	11	11	11	11	8	4
2	4	5	5	6	6	6	5	4	2

18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18

3	4	5	6	6	6	10	20	31	19
4	7	9	10	10	13	26	57	96	51
5	9	11	13	14	20	43	104	261	91
6	10	13	14	16	22	38	70	108	57
6	10	13	15	17	20	30	43	52	32
6	11	14	15	17	19	23	28	29	18
6	10	13	15	16	18	19	21	18	11
5	9	12	14	15	15	16	15	13	7
4	7	9	10	11	11	11	11	8	4
2	4	5	5	6	6	6	5	4	2