When I try to set the 'pivot' kw argument to any value, the result is: ``` Traceback (most recent call last): File "plotInpTrajOut_LocBag.py", line 265, in <module> ax.quiver(x,y,z,u,v,w,length=0.2,color=colors[guid_nb],pivot='tail') File "/usr/lib/python2.7/dist-packages/mpl_toolkits/mplot3d/axes3d.py", line 2614, in quiver linec = art3d.Line3DCollection(lines, *args[argi:], **kwargs) File "/usr/lib/python2.7/dist-packages/mpl_toolkits/mplot3d/art3d.py", line 171, in __init__ LineCollection.__init__(self, segments, *args, **kwargs) File "/usr/lib/python2.7/dist-packages/matplotlib/collections.py", line 1060, in __init__ **kwargs) File "/usr/lib/python2.7/dist-packages/matplotlib/collections.py", line 132, in __init__ self.update(kwargs) File "/usr/lib/python2.7/dist-packages/matplotlib/artist.py", line 757, in update raise AttributeError('Unknown property %s' % k) AttributeError: Unknown property pivot ``` I'm using matplotlib 1.4.2-3 under debian BTW, it seems to me that the documentation on possible 'pivot' values is not consistent. Hope it helps!