ortho projection w/ limits crashes

Basemap documentation states that ortho projection can take ll/ur crnr limits. The following code seems like it should work (mpl 1.4.0), but does not:

from mpl_toolkits.basemap import Basemap
m = Basemap(projection='ortho',lon_0=0,lat_0=0,llcrnrlat=-10,llcrnrlon=-10,urcrnrlat=10,urcrnrlon=10)

Error:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-5-98fbf042abb9> in <module>()
----> 1 m = Basemap(projection='ortho',lon_0=0,lat_0=0,llcrnrlat=-10,llcrnrlon=-10,urcrnrlat=10,urcrnrlon=10)

/Users/mankoff/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/mpl_toolkits/basemap/__init__.pyc in __init__(self, llcrnrlon, llcrnrlat, urcrnrlon, urcrnrlat, llcrnrx, llcrnry, urcrnrx, urcrnry, width, height, projection, resolution, area_thresh, rsphere, ellps, lat_ts, lat_1, lat_2, lat_0, lon_0, lon_1, lon_2, o_lon_p, o_lat_p, k_0, no_rot, suppress_ticks, satellite_height, boundinglat, fix_aspect, anchor, celestial, round, epsg, ax)
   1032         self.area_thresh = area_thresh
   1033         # define map boundary polygon (in lat/lon coordinates)
-> 1034         blons, blats, self._boundarypolyll, self._boundarypolyxy = self._getmapboundary()
   1035         self.boundarylats = blats
   1036         self.boundarylons = blons

/Users/mankoff/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/mpl_toolkits/basemap/__init__.pyc in _getmapboundary(self)
   1464             # circular region.
   1465             thetas = np.linspace(0.,2.*np.pi,2*nx*ny)[:-1]
-> 1466             rminor = self._height
   1467             rmajor = self._width
   1468             x = rmajor*np.cos(thetas) + rmajor

AttributeError: 'Basemap' object has no attribute '_height'
> /Users/mankoff/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/mpl_toolkits/basemap/__init__.py(1466)_getmapboundary()
   1465             thetas = np.linspace(0.,2.*np.pi,2*nx*ny)[:-1]
-> 1466             rminor = self._height
   1467             rmajor = self._width

ipdb>

Reproduziere das dokumentierte Beispiel für den Basemap-Konstruktor mit der ortho-Projektion und den angegebenen Eckgrenzen. Beginne am im Traceback gezeigten Einstiegspunkt _getmapboundary und verfolge dann, wie die Projektion ihre Dimensionen initialisiert. Erledigt ist es, wenn das Beispiel ohne den gemeldeten AttributeError abgeschlossen wird.