Chirality of example vortex
Problem to solve
At the moment, only counterclockwise vortices can be created in the examples.
Intended users
Anyone who is trying to create some example images.
Further details
Benefit: one would not have to change chirality by hand.
Proposal
If chirality is clockwise, invert sign of both component perpendicular to core axis. Nevertheless, I think this won't be the fastest solution.