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 99°C heat to the field 1x7
What is the temperature (rounded to whole numbers) in the field 5x4 after 127 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	5	4	2
4	7	9	10	10	11	10	9	7	4
5	9	11	13	13	14	13	12	9	5
6	10	13	15	15	16	15	14	10	5
8	14	17	18	17	17	16	15	11	6
15	28	27	24	21	19	17	15	11	6
31	65	48	33	25	20	18	15	11	6
54	162	73	40	26	20	17	14	10	5
32	65	47	31	21	16	13	10	7	4
14	25	22	16	11	9	7	5	4	2

Temperature in field 5x4 after 127 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	5	4	2
4	7	9	10	10	11	10	9	7	4
5	9	11	13	13	14	13	12	9	5
6	10	13	15	15	16	15	14	10	5
8	14	17	18	17	17	16	15	11	6
15	28	27	24	21	19	17	15	11	6
31	65	48	33	25	20	18	15	11	6
54	162	73	40	26	20	17	14	10	5
32	65	47	31	21	16	13	10	7	4
14	25	22	16	11	9	7	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	6	5	4	2
4	7	9	10	10	11	10	9	7	4
5	9	11	13	13	14	13	12	9	5
6	10	13	15	15	16	15	14	10	5
8	14	17	18	17	17	16	15	11	6
15	28	27	24	21	19	17	15	11	6
31	65	48	33	25	20	18	15	11	6
54	162	73	40	26	20	17	14	10	5
32	65	47	31	21	16	13	10	7	4
14	25	22	16	11	9	7	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	6	5	4	2
4	7	9	10	10	11	10	9	7	4
5	9	11	13	13	14	13	12	9	5
6	10	13	15	15	16	15	14	10	5
8	14	17	18	17	17	16	15	11	6
15	28	27	24	21	19	17	15	11	6
31	65	48	33	25	20	18	15	11	6
54	162	73	40	26	20	17	14	10	5
32	65	47	31	21	16	13	10	7	4
14	25	22	16	11	9	7	5	4	2