Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 26°C. We apply continuously 70°C heat to the field 5x5
What is the temperature (rounded to whole numbers) in the field 1x9 after 85 iterations according to the Gauss-Seidel iteration

Field in the beginning

26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626

Field after 4 iterations (rounded after 4th iteration)

4688999863
610131415161514105
813161820232219147
814182228353225189
9152028446348342211
91623356313468402512
9152232486852362311
814192534403628199
610141822252319137
3579111211973

Temperature in field 1x9 after 85 iterations: