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<title>Model doc</title>
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\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}
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