[vtkusers] Parallel coordinates Extraction

[Darshan Pai]

This example
http://www.vtk.org/Wiki/VTK/Examples/Python/Infovis/ParallelCoordinatesExtraction

I can run it , but can someone please explain this part in the code

rep.SetInputArrayToProcess(0,0,0,0,'RTDataGradient')
rep.SetInputArrayToProcess(1,0,0,0,'RTData')
rep.SetInputArrayToProcess(2,0,0,0,'Elevation')
rep.SetInputArrayToProcess(3,0,0,0,'BrownianVectors')

How is this data acquired ? I never used Infovis before so I am not clear
what these lines are doing exactly

Thanks in advance

Darshan
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