code: def plot_source_topos(self, common_scale=None):
          
          if self.unmixing_ is None and self.mixing_ is None:
              raise RuntimeError("No sources available (run do_mvarica first)")
  
          self._prepare_plots(True, True)
  
          self.plotting.plot_sources(self.topo_, self.mixmaps_, self.unmixmaps_, common_scale)
docs: Plot topography of the Source decomposition.
  
          Parameters
          ----------
          common_scale : float, optional
              If set to None, each topoplot's color axis is scaled individually. Otherwise specifies the percentile
              (1-99) of values in all plot. This value is taken as the maximum color scale.