Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 31°C. We apply continuously 74°C heat to the field 5x4
What is the temperature (rounded to whole numbers) in the field 5x2 after 143 iterations according to the Gauss-Seidel iteration

Field in the beginning

31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31

Field after 4 iterations (rounded after 4th iteration)

4	7	9	10	10	11	11	10	7	4
7	12	15	17	19	21	21	18	13	7
9	15	19	24	30	37	33	27	19	9
10	17	23	32	48	68	52	37	24	12
10	18	26	39	69	144	74	45	28	13
11	19	26	37	54	75	58	42	27	14
10	18	25	32	41	49	44	35	25	12
9	16	22	27	31	35	33	28	20	10
7	12	16	19	22	23	23	19	14	7
4	6	8	10	11	12	11	10	7	3

Temperature in field 5x2 after 143 iterations:

31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31

4	7	9	10	10	11	11	10	7	4
7	12	15	17	19	21	21	18	13	7
9	15	19	24	30	37	33	27	19	9
10	17	23	32	48	68	52	37	24	12
10	18	26	39	69	144	74	45	28	13
11	19	26	37	54	75	58	42	27	14
10	18	25	32	41	49	44	35	25	12
9	16	22	27	31	35	33	28	20	10
7	12	16	19	22	23	23	19	14	7
4	6	8	10	11	12	11	10	7	3

31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31

4	7	9	10	10	11	11	10	7	4
7	12	15	17	19	21	21	18	13	7
9	15	19	24	30	37	33	27	19	9
10	17	23	32	48	68	52	37	24	12
10	18	26	39	69	144	74	45	28	13
11	19	26	37	54	75	58	42	27	14
10	18	25	32	41	49	44	35	25	12
9	16	22	27	31	35	33	28	20	10
7	12	16	19	22	23	23	19	14	7
4	6	8	10	11	12	11	10	7	3

31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31

4	7	9	10	10	11	11	10	7	4
7	12	15	17	19	21	21	18	13	7
9	15	19	24	30	37	33	27	19	9
10	17	23	32	48	68	52	37	24	12
10	18	26	39	69	144	74	45	28	13
11	19	26	37	54	75	58	42	27	14
10	18	25	32	41	49	44	35	25	12
9	16	22	27	31	35	33	28	20	10
7	12	16	19	22	23	23	19	14	7
4	6	8	10	11	12	11	10	7	3