diff --git a/lib/xmet/skew_t.py b/lib/xmet/skew_t.py
index 5c52db1..dee40a3 100644
--- a/lib/xmet/skew_t.py
+++ b/lib/xmet/skew_t.py
@@ -74,8 +74,8 @@ class SkewT():
             x1, y1 = self.graph_to_screen(*self.sample_to_graph(temp, PRESSURE_MAX))
             x2, y2 = self.graph_to_screen(*self.sample_to_graph(temp, PRESSURE_MIN))
 
-            cr.move_to(x1, y1)
-            cr.line_to(x2, y2)
+            cr.move_to(x + x1, y + y1)
+            cr.line_to(x + x2, y + y2)
             cr.stroke()
 
     def draw_samples(self,