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 112°C heat to the field 8x7
What is the temperature (rounded to whole numbers) in the field 2x9 after 78 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	12	7
7	12	16	18	19	19	19	19	17	10
7	12	16	18	19	20	22	28	33	20
7	12	16	18	19	21	30	50	74	39
6	11	14	16	17	22	37	78	183	65
5	8	11	12	13	17	28	49	74	39
2	4	6	6	7	9	15	23	28	17

Temperature in field 2x9 after 78 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	12	7
7	12	16	18	19	19	19	19	17	10
7	12	16	18	19	20	22	28	33	20
7	12	16	18	19	21	30	50	74	39
6	11	14	16	17	22	37	78	183	65
5	8	11	12	13	17	28	49	74	39
2	4	6	6	7	9	15	23	28	17

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	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	12	7
7	12	16	18	19	19	19	19	17	10
7	12	16	18	19	20	22	28	33	20
7	12	16	18	19	21	30	50	74	39
6	11	14	16	17	22	37	78	183	65
5	8	11	12	13	17	28	49	74	39
2	4	6	6	7	9	15	23	28	17

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	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	12	7
7	12	16	18	19	19	19	19	17	10
7	12	16	18	19	20	22	28	33	20
7	12	16	18	19	21	30	50	74	39
6	11	14	16	17	22	37	78	183	65
5	8	11	12	13	17	28	49	74	39
2	4	6	6	7	9	15	23	28	17