diff --git a/notebooks/calibration_smoothing.ipynb b/notebooks/calibration_smoothing.ipynb
index 56dfef2..1765280 100644
--- a/notebooks/calibration_smoothing.ipynb
+++ b/notebooks/calibration_smoothing.ipynb
@@ -162,7 +162,7 @@
     "antnums = set([ant[0] for ant in cs.ants])\n",
     "flags_per_antnum = [np.sum(cs.flag_grids[ant, 'Jnn']) + np.sum(cs.flag_grids[ant, 'Jee']) for ant in antnums]\n",
     "\n",
-    "refant_nums = [ant[0] for ant in (cs.refant.values() if PER_POL_REFANT else [cs.refant]]\n",
+    "refant_nums = [ant[0] for ant in (cs.refant.values() if PER_POL_REFANT else [cs.refant])]\n",
     "candidate_ants = [ant for ant, nflags in zip(antnums, flags_per_antnum) if (ant not in refant_nums) and (nflags <= np.percentile(flags_per_antnum, 25))\n",
     "                  and not np.all(cs.flag_grids[ant, 'Jee']) and not np.all(cs.flag_grids[ant, 'Jnn'])]\n",
     "ants_to_plot = [func(candidate_ants) for func in (np.min, np.max)]\n",