Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 23°C. We apply continuously 91°C heat to the field 5x9
What is the temperature (rounded to whole numbers) in the field 9x3 after 42 iterations according to the Gauss-Seidel iteration

Field in the beginning

23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23

Field after 4 iterations (rounded after 4th iteration)

3	5	7	7	8	8	8	7	5	3
5	9	11	13	13	14	13	12	9	5
7	11	14	16	17	17	17	15	12	6
7	13	16	18	19	20	19	17	13	7
8	13	17	19	20	21	21	19	14	7
8	14	17	20	21	22	22	19	15	8
8	13	17	19	22	25	24	21	15	8
7	12	15	20	27	34	30	23	15	7
5	9	13	21	37	60	40	25	14	6
3	5	9	18	46	129	48	21	10	4

Temperature in field 9x3 after 42 iterations:

23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23

3	5	7	7	8	8	8	7	5	3
5	9	11	13	13	14	13	12	9	5
7	11	14	16	17	17	17	15	12	6
7	13	16	18	19	20	19	17	13	7
8	13	17	19	20	21	21	19	14	7
8	14	17	20	21	22	22	19	15	8
8	13	17	19	22	25	24	21	15	8
7	12	15	20	27	34	30	23	15	7
5	9	13	21	37	60	40	25	14	6
3	5	9	18	46	129	48	21	10	4

23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23

3	5	7	7	8	8	8	7	5	3
5	9	11	13	13	14	13	12	9	5
7	11	14	16	17	17	17	15	12	6
7	13	16	18	19	20	19	17	13	7
8	13	17	19	20	21	21	19	14	7
8	14	17	20	21	22	22	19	15	8
8	13	17	19	22	25	24	21	15	8
7	12	15	20	27	34	30	23	15	7
5	9	13	21	37	60	40	25	14	6
3	5	9	18	46	129	48	21	10	4

23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23
23	23	23	23	23	23	23	23	23	23

3	5	7	7	8	8	8	7	5	3
5	9	11	13	13	14	13	12	9	5
7	11	14	16	17	17	17	15	12	6
7	13	16	18	19	20	19	17	13	7
8	13	17	19	20	21	21	19	14	7
8	14	17	20	21	22	22	19	15	8
8	13	17	19	22	25	24	21	15	8
7	12	15	20	27	34	30	23	15	7
5	9	13	21	37	60	40	25	14	6
3	5	9	18	46	129	48	21	10	4