Join the data attributes with other plotters in the project

        This method joins the attributes of the
        :class:`~psyplot.InteractiveBase` instances in the project that
        draw on the same figure as this instance does.

        Parameters
        ----------
        delimiter: str
            Specifies the delimiter with what the attributes are joined. If
            None, the :attr:`delimiter` attribute of this instance or (if the
            latter is also None), the rcParams['texts.delimiter'] item is used.

        Returns
        -------
        dict
            A dictionary with all the meta attributes joined by the specified
            `delimiter`

def get_fig_data_attrs(self, delimiter=None):
        """Join the data attributes with other plotters in the project

        This method joins the attributes of the
        :class:`~psyplot.InteractiveBase` instances in the project that
        draw on the same figure as this instance does.

        Parameters
        ----------
        delimiter: str
            Specifies the delimiter with what the attributes are joined. If
            None, the :attr:`delimiter` attribute of this instance or (if the
            latter is also None), the rcParams['texts.delimiter'] item is used.

        Returns
        -------
        dict
            A dictionary with all the meta attributes joined by the specified
            `delimiter`"""
        if self.project is not None:
            delimiter = next(filter(lambda d: d is not None, [
                delimiter, self.delimiter, self.rc['delimiter']]))
            figs = self.project.figs
            fig = self.ax.get_figure()
            if self.plotter._initialized and fig in figs:
                ret = figs[fig].joined_attrs(delimiter=delimiter,
                                             plot_data=True)
            else:
                ret = self.get_enhanced_attrs(self.plotter.plot_data)
                self.logger.debug(
                    'Can not get the figure attributes because plot has not '
                    'yet been initialized!')
            return ret
        else:
            return self.get_enhanced_attrs(self.plotter.plot_data)