lammps/doc/Eqs/compute_xrd5.tex

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\begin{document}
$$
f_j\left ( \frac{sin(\theta)}{\lambda} \right )=\sum_{i}^{4}
a_i exp\left ( -b_i \frac{sin^{2}(\theta)}{\lambda^{2}} \right )+c
$$
\end{document}