Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 27°C. We apply continuously 123°C heat to the field 8x4
What is the temperature (rounded to whole numbers) in the field 6x0 after 74 iterations according to the Gauss-Seidel iteration

Field in the beginning

27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27

Field after 4 iterations (rounded after 4th iteration)

4	6	8	9	9	9	9	8	7	4
6	11	13	15	16	16	16	16	16	10
8	13	17	19	20	20	23	30	35	21
9	15	19	21	23	25	35	56	83	44
9	16	20	23	25	30	46	91	206	74
9	16	20	23	25	30	42	65	90	48
9	16	20	23	25	28	35	44	47	28
8	14	18	20	22	24	27	30	27	16
6	11	14	15	17	18	19	19	16	9
3	6	7	8	9	9	9	9	7	4

Temperature in field 6x0 after 74 iterations:

27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27

4	6	8	9	9	9	9	8	7	4
6	11	13	15	16	16	16	16	16	10
8	13	17	19	20	20	23	30	35	21
9	15	19	21	23	25	35	56	83	44
9	16	20	23	25	30	46	91	206	74
9	16	20	23	25	30	42	65	90	48
9	16	20	23	25	28	35	44	47	28
8	14	18	20	22	24	27	30	27	16
6	11	14	15	17	18	19	19	16	9
3	6	7	8	9	9	9	9	7	4

27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27

4	6	8	9	9	9	9	8	7	4
6	11	13	15	16	16	16	16	16	10
8	13	17	19	20	20	23	30	35	21
9	15	19	21	23	25	35	56	83	44
9	16	20	23	25	30	46	91	206	74
9	16	20	23	25	30	42	65	90	48
9	16	20	23	25	28	35	44	47	28
8	14	18	20	22	24	27	30	27	16
6	11	14	15	17	18	19	19	16	9
3	6	7	8	9	9	9	9	7	4

27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27
27	27	27	27	27	27	27	27	27	27

4	6	8	9	9	9	9	8	7	4
6	11	13	15	16	16	16	16	16	10
8	13	17	19	20	20	23	30	35	21
9	15	19	21	23	25	35	56	83	44
9	16	20	23	25	30	46	91	206	74
9	16	20	23	25	30	42	65	90	48
9	16	20	23	25	28	35	44	47	28
8	14	18	20	22	24	27	30	27	16
6	11	14	15	17	18	19	19	16	9
3	6	7	8	9	9	9	9	7	4