mpl_toolkits.mplot3d.proj3d.vec_pad_ones
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mpl_toolkits.mplot3d.proj3d.vec_pad_ones(xs, ys, zs)[source] 
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Licensed under the Matplotlib License Agreement.
    https://matplotlib.org/2.2.3/api/_as_gen/mpl_toolkits.mplot3d.proj3d.vec_pad_ones.html