diff --git a/report.tex b/report.tex
index 00f2f0b..61eee13 100644
--- a/report.tex
+++ b/report.tex
@@ -259,7 +259,7 @@
         fo/.style={sys, fill=red!10, very thick},
         rel/.style={->, thick},
         weak/.style={->, semithick, dashed},
-        equv/.style={<->, thick}
+        equv/.style={<->, thick, dotted}
       ]
 
       \node[std] (bssn) {BSSN};