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 155°C heat to the field 4x9
What is the temperature (rounded to whole numbers) in the field 7x2 after 121 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	23	21	16	8
10	17	22	25	26	27	26	23	18	9
10	18	23	26	28	28	28	25	19	10
11	18	24	27	29	30	29	26	20	10
10	18	23	29	34	34	32	27	20	10
9	16	24	38	51	45	36	28	19	9
7	15	29	57	96	64	40	26	16	7
4	11	28	75	217	79	34	18	9	4

Temperature in field 7x2 after 121 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	23	21	16	8
10	17	22	25	26	27	26	23	18	9
10	18	23	26	28	28	28	25	19	10
11	18	24	27	29	30	29	26	20	10
10	18	23	29	34	34	32	27	20	10
9	16	24	38	51	45	36	28	19	9
7	15	29	57	96	64	40	26	16	7
4	11	28	75	217	79	34	18	9	4

31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	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	23	21	16	8
10	17	22	25	26	27	26	23	18	9
10	18	23	26	28	28	28	25	19	10
11	18	24	27	29	30	29	26	20	10
10	18	23	29	34	34	32	27	20	10
9	16	24	38	51	45	36	28	19	9
7	15	29	57	96	64	40	26	16	7
4	11	28	75	217	79	34	18	9	4

31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	31	31	31	31
31	31	31	31	31	31	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	23	21	16	8
10	17	22	25	26	27	26	23	18	9
10	18	23	26	28	28	28	25	19	10
11	18	24	27	29	30	29	26	20	10
10	18	23	29	34	34	32	27	20	10
9	16	24	38	51	45	36	28	19	9
7	15	29	57	96	64	40	26	16	7
4	11	28	75	217	79	34	18	9	4