Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 39°C. We apply continuously 87°C heat to the field 1x3
What is the temperature (rounded to whole numbers) in the field 4x7 after 148 iterations according to the Gauss-Seidel iteration

Field in the beginning

39393939393939393939
39393939393939393939
39393939393939393939
39393939393939393939
39393939393939393939
39393939393939393939
39393939393939393939
39393939393939393939
39393939393939393939
39393939393939393939

Field after 4 iterations (rounded after 4th iteration)

71314141414131295
1731312926252321158
33675543363330272010
561558154433835302312
38756351444037322413
25454845424038332513
18323839393837322412
14243033343432282111
1017222425252421158
5911121313121184

Temperature in field 4x7 after 148 iterations: