Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 23°C. We apply continuously 129°C heat to the field 8x7
What is the temperature (rounded to whole numbers) in the field 4x9 after 79 iterations according to the Gauss-Seidel iteration

Field in the beginning

23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23

Field after 4 iterations (rounded after 4th iteration)

3	5	7	7	8	8	8	7	5	3
5	9	11	13	13	14	13	12	9	5
7	11	14	16	17	17	17	15	12	6
7	13	16	18	19	20	19	17	14	8
8	13	17	19	20	21	21	21	19	12
8	14	17	20	21	22	24	31	37	22
8	13	17	19	21	23	33	56	85	45
7	12	15	17	19	24	42	89	210	74
5	9	12	13	15	19	32	56	85	44
3	5	6	7	8	10	16	26	32	19

Temperature in field 4x9 after 79 iterations:

23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23

3	5	7	7	8	8	8	7	5	3
5	9	11	13	13	14	13	12	9	5
7	11	14	16	17	17	17	15	12	6
7	13	16	18	19	20	19	17	14	8
8	13	17	19	20	21	21	21	19	12
8	14	17	20	21	22	24	31	37	22
8	13	17	19	21	23	33	56	85	45
7	12	15	17	19	24	42	89	210	74
5	9	12	13	15	19	32	56	85	44
3	5	6	7	8	10	16	26	32	19

23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23

3	5	7	7	8	8	8	7	5	3
5	9	11	13	13	14	13	12	9	5
7	11	14	16	17	17	17	15	12	6
7	13	16	18	19	20	19	17	14	8
8	13	17	19	20	21	21	21	19	12
8	14	17	20	21	22	24	31	37	22
8	13	17	19	21	23	33	56	85	45
7	12	15	17	19	24	42	89	210	74
5	9	12	13	15	19	32	56	85	44
3	5	6	7	8	10	16	26	32	19

23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23

3	5	7	7	8	8	8	7	5	3
5	9	11	13	13	14	13	12	9	5
7	11	14	16	17	17	17	15	12	6
7	13	16	18	19	20	19	17	14	8
8	13	17	19	20	21	21	21	19	12
8	14	17	20	21	22	24	31	37	22
8	13	17	19	21	23	33	56	85	45
7	12	15	17	19	24	42	89	210	74
5	9	12	13	15	19	32	56	85	44
3	5	6	7	8	10	16	26	32	19