[Paraview] Stream tracer in 2D

[Hom Nath Gharti]

I have 2D scalar field as shown in figure scalar_2d.png.
I apply 'Gradient' and 'Stream Tracer' filters respectively.
stream_2d.png is the resulting figure. But obviously that's wrong. Is there
something I am doing wrong?

Many thanks,
Hom Nath
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