code: def plot_sections(self, fout_dir=".", **kws_pltargs):
          
          hdrgos = self.grprobj.hdrobj.get_section_hdrgos()
          pltargs = PltGroupedGosArgs(self.grprobj, fout_dir=fout_dir, **kws_pltargs)
          return self._plot_groups_hdrgos(hdrgos, pltargs)
docs: Plot GO DAGs for all sections (not Misc.).