Im a bit confused of how I should use the "quiver" plotting function.

My data is 2D, a 512x512 data array, where every entry is an angle
(polarimetry).
I also have an array with the degree of polarization which would be nice to
colour-code in to the arrows.
So:
How do I use my angles to control the direction of the arrows, and how do I
get values to control the colour of the arrows?

Cheers,
Magnus

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