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 123°C heat to the field 5x6
What is the temperature (rounded to whole numbers) in the field 7x6 after 87 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	10	9	7	4
7	12	15	17	18	18	18	16	12	6
9	15	19	22	23	24	24	21	16	8
10	17	22	25	28	32	31	26	19	10
10	18	23	29	39	50	45	35	24	12
11	18	25	38	64	98	72	48	30	14
10	19	28	48	97	221	105	58	33	16
9	17	25	41	68	102	75	49	29	14
7	13	19	28	41	52	45	33	21	10
4	7	10	14	19	23	21	16	11	5

Temperature in field 7x6 after 87 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	10	9	7	4
7	12	15	17	18	18	18	16	12	6
9	15	19	22	23	24	24	21	16	8
10	17	22	25	28	32	31	26	19	10
10	18	23	29	39	50	45	35	24	12
11	18	25	38	64	98	72	48	30	14
10	19	28	48	97	221	105	58	33	16
9	17	25	41	68	102	75	49	29	14
7	13	19	28	41	52	45	33	21	10
4	7	10	14	19	23	21	16	11	5

31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	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	10	9	7	4
7	12	15	17	18	18	18	16	12	6
9	15	19	22	23	24	24	21	16	8
10	17	22	25	28	32	31	26	19	10
10	18	23	29	39	50	45	35	24	12
11	18	25	38	64	98	72	48	30	14
10	19	28	48	97	221	105	58	33	16
9	17	25	41	68	102	75	49	29	14
7	13	19	28	41	52	45	33	21	10
4	7	10	14	19	23	21	16	11	5

31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	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	10	9	7	4
7	12	15	17	18	18	18	16	12	6
9	15	19	22	23	24	24	21	16	8
10	17	22	25	28	32	31	26	19	10
10	18	23	29	39	50	45	35	24	12
11	18	25	38	64	98	72	48	30	14
10	19	28	48	97	221	105	58	33	16
9	17	25	41	68	102	75	49	29	14
7	13	19	28	41	52	45	33	21	10
4	7	10	14	19	23	21	16	11	5