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 189°C heat to the field 4x0
What is the temperature (rounded to whole numbers) in the field 4x4 after 51 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	10	29	86	258	90	36	17	8	4
5	13	31	65	111	71	40	23	13	6
6	13	25	42	57	47	34	23	15	7
6	12	20	29	35	33	27	21	14	7
6	12	17	22	25	25	23	19	14	7
6	11	15	18	20	21	20	17	13	7
6	11	14	16	18	18	18	16	12	6
5	9	12	14	15	16	15	14	10	5
4	7	9	10	11	12	11	10	7	4
2	4	5	5	6	6	6	5	4	2

Temperature in field 4x4 after 51 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	10	29	86	258	90	36	17	8	4
5	13	31	65	111	71	40	23	13	6
6	13	25	42	57	47	34	23	15	7
6	12	20	29	35	33	27	21	14	7
6	12	17	22	25	25	23	19	14	7
6	11	15	18	20	21	20	17	13	7
6	11	14	16	18	18	18	16	12	6
5	9	12	14	15	16	15	14	10	5
4	7	9	10	11	12	11	10	7	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	10	29	86	258	90	36	17	8	4
5	13	31	65	111	71	40	23	13	6
6	13	25	42	57	47	34	23	15	7
6	12	20	29	35	33	27	21	14	7
6	12	17	22	25	25	23	19	14	7
6	11	15	18	20	21	20	17	13	7
6	11	14	16	18	18	18	16	12	6
5	9	12	14	15	16	15	14	10	5
4	7	9	10	11	12	11	10	7	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	10	29	86	258	90	36	17	8	4
5	13	31	65	111	71	40	23	13	6
6	13	25	42	57	47	34	23	15	7
6	12	20	29	35	33	27	21	14	7
6	12	17	22	25	25	23	19	14	7
6	11	15	18	20	21	20	17	13	7
6	11	14	16	18	18	18	16	12	6
5	9	12	14	15	16	15	14	10	5
4	7	9	10	11	12	11	10	7	4
2	4	5	5	6	6	6	5	4	2