diff --git a/03_geoide.gp b/03_geoide.gp
index 830d8f7..acd09d0 100644
--- a/03_geoide.gp
+++ b/03_geoide.gp
@@ -5,7 +5,7 @@
 #  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
 #
 
-set terminal lua tikz solid color tikzarrows scale 0.95,0.8
+set terminal lua tikz solid color tikzarrows
 set output "../img/03_geoide.gtx"
 
 unset key
@@ -13,6 +13,8 @@ unset border
 unset xtics
 unset ytics
 unset ztics
-set dummy u,v
+set samples 64, 64
+set isosamples 13, 13
 set parametric
-splot cos(u)*cos(v),cos(u)*sin(v),sin(u) lt 2
\ No newline at end of file
+set dummy u, v
+splot cos(u)*cos(v),cos(u)*sin(v),sin(u) lt 3
\ No newline at end of file