diff --git a/lib/xmet/hodograph.py b/lib/xmet/hodograph.py
index a14bd6f..7b69537 100644
--- a/lib/xmet/hodograph.py
+++ b/lib/xmet/hodograph.py
@@ -167,10 +167,7 @@ class Hodograph():
                 return self.COLORS[key]
 
     def each_significant_sample(self, sounding: Sounding):
-        for sample in sounding.samples:
-            if sample.height is None:
-                continue
-
+        for sample in sounding.hodograph_samples():
             if self.color(sample.height) is None:
                 break