'Get the default line2D instance'

def _get_gridline(self):

    l = mlines.Line2D(xdata=(0.0, 0.0), ydata=(0, 1.0), color=rcParams[u'grid.color'], linestyle=rcParams[u'grid.linestyle'], linewidth=rcParams[u'grid.linewidth'], alpha=rcParams[u'grid.alpha'], markersize=0)
    l.set_transform(self.axes.get_xaxis_transform(which=u'grid'))
    l.get_path()._interpolation_steps = GRIDLINE_INTERPOLATION_STEPS
    self._set_artist_props(l)
    return l
