code: def _plot_go_group(self, hdrgo, usrgos, pltargs, go2parentids):
          
          gosubdagplotnts = self._get_gosubdagplotnts(hdrgo, usrgos, pltargs, go2parentids)
          # Create pngs and return png names
          pngs = [obj.wrplt(pltargs.fout_dir, pltargs.plt_ext) for obj in gosubdagplotnts]
          return pngs
docs: Plot an exploratory GO DAG for a single Group of user GOs.