Generator over all the slices selected, each time returning a cross-section.

        Parameters
        ----------

        extended : bool
            Flag to return just slice data (default, extended=False), or
                return a tuple of axis, slice_num, slice_data (extended=True)

        Returns
        -------

        slice_data : an image (just slice data, default, with extended=False), or
                a tuple of axis, slice_num, slice_data (extended=True)

def get_slices(self, extended=False):
        """Generator over all the slices selected, each time returning a cross-section.

        Parameters
        ----------

        extended : bool
            Flag to return just slice data (default, extended=False), or
                return a tuple of axis, slice_num, slice_data (extended=True)

        Returns
        -------

        slice_data : an image (just slice data, default, with extended=False), or
                a tuple of axis, slice_num, slice_data (extended=True)

        """

        for dim, slice_num in self._slices:
            yield self._get_axis(self._image, dim, slice_num, extended=extended)