Quiver - no auto scaling

Supplying S as an argument instead of a keyword worked for fixing the size, but I lost the arrow heads.

Any suggestions?

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quiver()'s argument handling is very fragile. You can't use keyword arguments.
If you want to use the S argument you have to invoke quiver() like so:

  quiver(X, Y, U, V, S)

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Ms. Carol A. Leger
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