'Set the latitude(s) at which to stop drawing the longitude grids.
Often, in geographic projections, you wouldn\'t want to draw
longitude gridlines near the poles.  This allows the user to
specify the degree at which to stop drawing longitude grids.
This is an example method that is specific to this projection
class -- it provides an interface to something that has no
analogy in the base Axes class.'

def set_longitude_grid_ends(self, degrees):

    self._longitude_cap = np.deg2rad(degrees)
    self._xaxis_pretransform.clear().scale(1.0, (self._longitude_cap * 2.0)).translate(0.0, (- self._longitude_cap))
