[Paraview] generate streamlines of lagrangian particles

[Maryam]

hi all, 

does somebody know how to generate streamlines of lagrangian particles? 
I execute the following steps:
1. add the temporal cache filter
2. add a line source for seeds
3. add a ParticleTracer filter  
I only see the starting points, no tracing occurs.

thanx alot
Maryam
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