diff --git a/lib/xmet/hodograph.py b/lib/xmet/hodograph.py
index 9183837..84af9ca 100644
--- a/lib/xmet/hodograph.py
+++ b/lib/xmet/hodograph.py
@@ -6,12 +6,6 @@ from typing import Iterable
 from xmet.igra     import IGRAReader
 from xmet.sounding import Sounding, SoundingSample
 
-IMAGE_WIDTH = 800
-IMAGE_HEIGHT = 800
-
-GRAPH_WIDTH  = IMAGE_WIDTH  - 128
-GRAPH_HEIGHT = IMAGE_HEIGHT - 128
-
 WIND_SPEED_MAX  = 90 # knots
 WIND_SPEED_MIN  = 10
 WIND_SPEED_STEP = 10