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 140°C heat to the field 7x5
What is the temperature (rounded to whole numbers) in the field 3x9 after 48 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
610131415151514116
8131618192022231810
8141821222635453418
91519222537641006430
9152023295010324010241
91519232944731087133
8141720243346564322
6101315182228302413
35789111313116

Temperature in field 3x9 after 48 iterations: