ortho projection w/ limits crashes

Reproduce the documented Basemap constructor example with the ortho projection and the supplied corner limits. Start at the _getmapboundary entry point shown in the traceback, then trace how the projection initializes its dimensions. Done means the example completes without the reported AttributeError.

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>