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diff --git a/model_doc/bpl.tex b/model_doc/bpl.tex
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+\documentclass{article}
+\usepackage{amsmath}
+\usepackage{amssymb}
+\usepackage{amsfonts}
+
+\thispagestyle{empty}
+\begin{document}
+\begin{equation}
+  y=\left\{\begin{array}{c}
+      y_{\rm break}(\frac{x}{x_{\rm break}})^{\gamma_1} (x<x_{\rm break})\\
+      y_{\rm break}(\frac{x}{x_{\rm break}})^{\gamma_2} (x>=x_{\rm break})
+      \end{array}
+      \right .\notag
+\end{equation}
+\end{document}