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Plot Field Vectors in 3D
Plot a vector field given by a function on a regular grid.
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VectorPlot3D[{x, y^2, z - x}, {x, -3, 3}, {y, -3, 3}, {z, -3, 3}, 

 Axes -> False, BoxRatios -> Automatic, Boxed -> False, 

 VectorStyle -> "Arrow3D", VectorPoints -> 7, 

 VectorColorFunction -> "SunsetColors", 

 VectorScale -> {0.3, Scaled[0.4]}]
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