diff --git a/doc/src/Eqs/pair_atm.tex b/doc/src/Eqs/pair_atm.tex
index 0e05370faf..fce1db99b8 100644
--- a/doc/src/Eqs/pair_atm.tex
+++ b/doc/src/Eqs/pair_atm.tex
@@ -4,6 +4,6 @@
 
 \begin{equation}
 E=\nu\frac{1+3\cos\gamma_1\cos\gamma_2\cos\gamma_3}{r_{12}^3r_{23}^3r_{31}^3}
-\end{equation}                           
+\end{equation}
 
 \end{document}