def METHOD_NAME(self):
    return """\
    x
        :class:`plotly.graph_objects.volume.caps.X` instance or
        dict with compatible properties
    y
        :class:`plotly.graph_objects.volume.caps.Y` instance or
        dict with compatible properties
    z
        :class:`plotly.graph_objects.volume.caps.Z` instance or
        dict with compatible properties
    """