diff --git a/fig-poly-red.tex b/fig-poly-red.tex
index a688107..b449039 100644
--- a/fig-poly-red.tex
+++ b/fig-poly-red.tex
@@ -1,5 +1,5 @@
 \begin{tikzpicture}
-  \tikzstyle{positive}=[pattern=horizontal lines light gray]
+  \tikzstyle{positive}=[pattern=north east lines, pattern color=blue!30]
   \tikzstyle{negative}=[pattern=dots, pattern color=red!30]
 
     % Language A