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 109°C heat to the field 7x7
What is the temperature (rounded to whole numbers) in the field 6x5 after 74 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	8	10	12	12	12	12	11	8	4
6	10	13	15	16	16	16	14	11	6
7	12	15	17	18	18	18	16	13	7
7	12	16	18	19	19	21	21	17	9
7	12	16	18	19	22	30	37	28	15
7	12	16	18	21	30	51	78	51	24
6	11	14	16	21	37	78	185	78	31
5	8	11	13	17	28	51	78	50	23
2	4	6	7	9	15	24	31	23	11

Temperature in field 6x5 after 74 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	8	10	12	12	12	12	11	8	4
6	10	13	15	16	16	16	14	11	6
7	12	15	17	18	18	18	16	13	7
7	12	16	18	19	19	21	21	17	9
7	12	16	18	19	22	30	37	28	15
7	12	16	18	21	30	51	78	51	24
6	11	14	16	21	37	78	185	78	31
5	8	11	13	17	28	51	78	50	23
2	4	6	7	9	15	24	31	23	11

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	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	8	10	12	12	12	12	11	8	4
6	10	13	15	16	16	16	14	11	6
7	12	15	17	18	18	18	16	13	7
7	12	16	18	19	19	21	21	17	9
7	12	16	18	19	22	30	37	28	15
7	12	16	18	21	30	51	78	51	24
6	11	14	16	21	37	78	185	78	31
5	8	11	13	17	28	51	78	50	23
2	4	6	7	9	15	24	31	23	11

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	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	8	10	12	12	12	12	11	8	4
6	10	13	15	16	16	16	14	11	6
7	12	15	17	18	18	18	16	13	7
7	12	16	18	19	19	21	21	17	9
7	12	16	18	19	22	30	37	28	15
7	12	16	18	21	30	51	78	51	24
6	11	14	16	21	37	78	185	78	31
5	8	11	13	17	28	51	78	50	23
2	4	6	7	9	15	24	31	23	11