docs: 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)