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 135°C heat to the field 7x4
What is the temperature (rounded to whole numbers) in the field 0x3 after 86 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	6	6	5	3
4	7	9	10	10	11	13	15	12	7
5	9	11	13	13	17	26	36	28	14
6	10	13	14	17	28	55	90	57	26
6	10	13	16	21	41	92	225	94	37
6	11	14	16	22	36	64	99	64	30
6	10	13	16	19	28	41	51	39	20
5	9	12	14	16	21	26	29	23	13
4	7	9	10	12	14	16	16	13	7
2	4	5	5	6	7	8	8	6	3

Temperature in field 0x3 after 86 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	6	6	5	3
4	7	9	10	10	11	13	15	12	7
5	9	11	13	13	17	26	36	28	14
6	10	13	14	17	28	55	90	57	26
6	10	13	16	21	41	92	225	94	37
6	11	14	16	22	36	64	99	64	30
6	10	13	16	19	28	41	51	39	20
5	9	12	14	16	21	26	29	23	13
4	7	9	10	12	14	16	16	13	7
2	4	5	5	6	7	8	8	6	3

18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	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	6	6	5	3
4	7	9	10	10	11	13	15	12	7
5	9	11	13	13	17	26	36	28	14
6	10	13	14	17	28	55	90	57	26
6	10	13	16	21	41	92	225	94	37
6	11	14	16	22	36	64	99	64	30
6	10	13	16	19	28	41	51	39	20
5	9	12	14	16	21	26	29	23	13
4	7	9	10	12	14	16	16	13	7
2	4	5	5	6	7	8	8	6	3

18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	18	18	18	18
18	18	18	18	18	18	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	6	6	5	3
4	7	9	10	10	11	13	15	12	7
5	9	11	13	13	17	26	36	28	14
6	10	13	14	17	28	55	90	57	26
6	10	13	16	21	41	92	225	94	37
6	11	14	16	22	36	64	99	64	30
6	10	13	16	19	28	41	51	39	20
5	9	12	14	16	21	26	29	23	13
4	7	9	10	12	14	16	16	13	7
2	4	5	5	6	7	8	8	6	3