Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 28°C. We apply continuously 187°C heat to the field 1x9
What is the temperature (rounded to whole numbers) in the field 7x5 after 70 iterations according to the Gauss-Seidel iteration

Field in the beginning

28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828

Field after 4 iterations (rounded after 4th iteration)

47899109863
711141516171615116
814182021212119147
915202223242421168
916212325262523179
1017222526262623189
1224282827272623179
2445423529262421158
48102684228221916115
742538938201310863

Temperature in field 7x5 after 70 iterations: