diff --git a/lib/xmet/hodograph.py b/lib/xmet/hodograph.py
index 79cc4d1..3b9965a 100644
--- a/lib/xmet/hodograph.py
+++ b/lib/xmet/hodograph.py
@@ -226,8 +226,6 @@ class Hodograph():
         min_x, min_y = self.extents['min']
         max_x, max_y = self.extents['max']
 
-        box = max(max_x - min_x, max_y - min_y)
-
         for sample in self.each_significant_sample(sounding):
             color = self.color(sample.height)