def add_sources_from_roi(self, names, roi, free=False, **kwargs):
        """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.

        """

        for name in names:
            self.add_source(name, roi[name].data, free=free, **kwargs)