diff --git a/yli/graphs.py b/yli/graphs.py
index 99585c3..c20c927 100644
--- a/yli/graphs.py
+++ b/yli/graphs.py
@@ -1,5 +1,5 @@
 #   scipy-yli: Helpful SciPy utilities and recipes
-#   Copyright © 2022–2023  Lee Yingtong Li (RunasSudo)
+#   Copyright © 2022–2024  Lee Yingtong Li (RunasSudo)
 #
 #   This program is free software: you can redistribute it and/or modify
 #   it under the terms of the GNU Affero General Public License as published by
@@ -52,6 +52,9 @@ class HorizontalEffectPlot:
 		self.text_right[0].append(EffectPlotText(header_y, measure_name, skip_width=True, ha='center', fontweight='medium'))
 		self.text_right[2].append(EffectPlotText(header_y, '(95% CI)', skip_width=True, ha='center', fontweight='medium'))
 		self.text_right[5].append(EffectPlotText(header_y, 'p', skip_width=True, ha='center', fontweight='medium', fontstyle='italic'))
+		
+		self.fig = None
+		self.ax = None
 	
 	def add_nobar(self, y, label, mean=None, ci0=None, ci1=None, pvalue=None):
 		# Label
@@ -117,7 +120,9 @@ class HorizontalEffectPlot:
 		
 		fig_height = 0.3 * max(d.y for d in self.data) + 0.2
 		
-		self.fig, self.ax = plt.subplots(figsize=(width, fig_height))
+		if self.fig is None or self.ax is None:
+			self.fig, self.ax = plt.subplots(figsize=(width, fig_height))
+		
 		if xscale == 'log':
 			self.ax.axvline(1, color='grey', linewidth=1)
 		else: