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 90°C heat to the field 1x5
What is the temperature (rounded to whole numbers) in the field 2x2 after 30 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	9	11	12	12	13	12	11	8	4
7	14	17	17	17	17	16	14	11	6
14	27	27	24	21	20	18	16	12	6
30	62	47	34	26	23	20	18	13	7
52	151	71	42	30	24	21	18	14	7
33	66	51	37	29	24	21	18	13	7
19	33	33	28	24	21	19	16	11	6
10	18	20	19	17	16	14	12	8	4
5	8	9	9	9	8	7	6	4	2

Temperature in field 2x2 after 30 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	9	11	12	12	13	12	11	8	4
7	14	17	17	17	17	16	14	11	6
14	27	27	24	21	20	18	16	12	6
30	62	47	34	26	23	20	18	13	7
52	151	71	42	30	24	21	18	14	7
33	66	51	37	29	24	21	18	13	7
19	33	33	28	24	21	19	16	11	6
10	18	20	19	17	16	14	12	8	4
5	8	9	9	9	8	7	6	4	2

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	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	9	11	12	12	13	12	11	8	4
7	14	17	17	17	17	16	14	11	6
14	27	27	24	21	20	18	16	12	6
30	62	47	34	26	23	20	18	13	7
52	151	71	42	30	24	21	18	14	7
33	66	51	37	29	24	21	18	13	7
19	33	33	28	24	21	19	16	11	6
10	18	20	19	17	16	14	12	8	4
5	8	9	9	9	8	7	6	4	2

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	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	9	11	12	12	13	12	11	8	4
7	14	17	17	17	17	16	14	11	6
14	27	27	24	21	20	18	16	12	6
30	62	47	34	26	23	20	18	13	7
52	151	71	42	30	24	21	18	14	7
33	66	51	37	29	24	21	18	13	7
19	33	33	28	24	21	19	16	11	6
10	18	20	19	17	16	14	12	8	4
5	8	9	9	9	8	7	6	4	2