def _burnup_plot_default(self):
        self.load_bu_k()
        bcep = _burnup_criticality_estimator_plot(self.BU_F_, self.k_F_, self.burnup, self.batches)

        line = bcep.plot_components[0]
        top_cursor = line.overlays[self.batches - 1]
        self.top_cursor = top_cursor

        return bcep
 def _batches_changed(self):
     self.load_bu_k()
     bcep = _burnup_criticality_estimator_plot(self.BU_F_, self.k_F_, self.burnup, self.batches)
     self.burnup_plot = bcep