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diff --git a/model_doc/nfw_int.tex b/model_doc/nfw_int.tex
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+\documentclass{article}
+\usepackage{amsmath}
+\usepackage{amssymb}
+\usepackage{amsfonts}
+
+\thispagestyle{empty}
+\begin{document}
+\begin{equation}
+  M(<R)=4\pi\rho_0R_s^3(\ln(\frac{R+R_s}{R_s})-\frac{R}{R+R_s})\notag
+\end{equation}
+\end{document}