--- /dev/null
+# vtk DataFile Version 3.0
+vtk output
+ASCII
+DATASET UNSTRUCTURED_GRID
+POINTS 6 float
+ 0 1 0.0
+ 0 0 0.0
+ 1 0 0.0
+ 0 1 0.0
+ 1 0 0.0
+ 1 1 0.0
+CELLS 2 8
+3 0 1 2
+3 3 4 5
+CELL_TYPES 2
+5
+5
+CELL_DATA 2
+POINT_DATA 6
+SCALARS sol float 2
+LOOKUP_TABLE default
+-1 1 -1 0 0 -0 0 0 0 0 0 0