[Python] matplotlib.pyplot.quiver draws gigantic arrows, 'scale' or 'width' as parameter,...

I am drawing a graph with the path of a vector and the position of thissame vector at a given time. I am using quiver in 3D, but when I try to use scale or width in the parameters, it gives an error. It plots the vector, but it has a too-big arrow. The two "side lines", which are making arrow point are to big. How to make them a litle bit smaller?

ax = plt.axes(projection='3d')
ax.set_autoscalex_on(True)
ax.scatter3D(x, y, z, s=0.4 )
#x, y and z are arrays with coordinates of points
ax.quiver(0, 0, 0, x[10], y[10], z[10], color='red')
{}s'.format(step)

plt.show()

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