[Paraview] multiple profiles

[Stephen Wornom]

I would like to write several profiles on the same .vtk file for example:

# vtk DataFile Version 2.0
My data/n
ASCII

DATASET UNSTRUCTURED_GRID
POINTS 35053 float
...

CELLS 172722 863610
...

CELL_TYPES 172722
...

POINT_DATA 35053

SCALARS Maillage1 float 2
LOOKUP_TABLE Pressure
...
LOOKUP_TABLE Density
...
 when I start paraview only the last profile is veriable with the name 
"point Maillage1 (2)." How should I write the vtk file so that
point Pressure
point Density
are both available?
Stephen