def _function(self):
        """
        Waits until stopped to keep script live. Gui must handle calling of Toggle_NV function on mouse click.
        """

        self.data = {'nv_locations': [], 'image_data': None, 'extent': None}

        self.progress = 50
        self.updateProgress.emit(self.progress)
        # keep script alive while NVs are selected
        while not self._abort:
            time.sleep(1)