diff --git a/doc/Eqs/pair_gauss.jpg b/doc/Eqs/pair_gauss.jpg
index b09ad95458..966706bb1c 100644
Binary files a/doc/Eqs/pair_gauss.jpg and b/doc/Eqs/pair_gauss.jpg differ
diff --git a/doc/Eqs/pair_gauss.tex b/doc/Eqs/pair_gauss.tex
index 1821ae31d3..7ca1078090 100644
--- a/doc/Eqs/pair_gauss.tex
+++ b/doc/Eqs/pair_gauss.tex
@@ -3,7 +3,7 @@
 \begin{document}
 
 $$
-   E = A \exp(-B r^2) \qquad r < r_c
+   E = - A \exp(-B r^2) \qquad r < r_c
 $$
 
 \end{document}