code: def add_sources_from_roi(self, names, roi, free=False, **kwargs):
          
  
          for name in names:
              self.add_source(name, roi[name].data, free=free, **kwargs)
docs: Add multiple sources to the current ROI model copied from another ROI model.
  
          Parameters
          ----------
  
          names : list
              List of str source names to add.
  
          roi : `~fermipy.roi_model.ROIModel` object
              The roi model from which to add sources.
  
          free : bool
              Initialize the source with a free normalization paramter.