Temperature in a square plate, mixed conditions.
4 6 0
2.0  2.0
2.0  4.0
3.0  3.0
4.0  2.0
4.0  4.0
3.0  0.3
1 0.0  0.0
2 6.0  0.0
3 6.0  6.0
4 0.0  6.0
1 2  300.0  0.0  0.0
2 3    0.0  0.0  0.0
3 2    0.0  0.0  0.0
4 3  300.0  0.0  0.0