diff --git a/doc/Eqs/compute_saed1.jpg b/doc/Eqs/compute_saed1.jpg
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diff --git a/doc/Eqs/compute_saed1.tex b/doc/Eqs/compute_saed1.tex
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+\documentstyle[12pt]{article}
+
+\begin{document}
+
+$$ 
+  I=\frac{F^{*}F}{N}
+$$
+
+\end{document}
+
diff --git a/doc/Eqs/compute_saed2.jpg b/doc/Eqs/compute_saed2.jpg
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diff --git a/doc/Eqs/compute_saed2.tex b/doc/Eqs/compute_saed2.tex
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+++ b/doc/Eqs/compute_saed2.tex
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+\documentstyle[12pt]{article}
+
+\begin{document}
+
+$$ 
+  F(\mathbf{k})=\sum_{j=1}^{N}f_j(\theta)exp(2\pi i \mathbf{k}\cdot \mathbf{r}_j)
+$$
+\end{document}
+
diff --git a/doc/Eqs/compute_saed3.jpg b/doc/Eqs/compute_saed3.jpg
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diff --git a/doc/Eqs/compute_saed3.tex b/doc/Eqs/compute_saed3.tex
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+++ b/doc/Eqs/compute_saed3.tex
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+\documentstyle[12pt]{article}
+
+\begin{document}
+
+$$ 
+  f_j\left ( \frac{sin(\theta)}{\lambda} \right )=\sum_{i}^{5}
+a_i exp\left ( -b_i \frac{sin^{2}(\theta)}{\lambda^{2}} \right )
+$$
+\end{document}
+
diff --git a/doc/Eqs/compute_xrd1.jpg b/doc/Eqs/compute_xrd1.jpg
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diff --git a/doc/Eqs/compute_xrd1.tex b/doc/Eqs/compute_xrd1.tex
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index 0000000000..6e749c768d
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+++ b/doc/Eqs/compute_xrd1.tex
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+\documentstyle[12pt]{article}
+
+\begin{document}
+
+$$ 
+  I=Lp(\theta)\frac{F^{*}F}{N}
+$$
+
+\end{document}
+
diff --git a/doc/Eqs/compute_xrd2.jpg b/doc/Eqs/compute_xrd2.jpg
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diff --git a/doc/Eqs/compute_xrd2.tex b/doc/Eqs/compute_xrd2.tex
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index 0000000000..d005602339
--- /dev/null
+++ b/doc/Eqs/compute_xrd2.tex
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+\documentstyle[12pt]{article}
+
+\begin{document}
+
+$$ 
+  F(\mathbf{k})=\sum_{j=1}^{N}f_j(\theta)exp(2\pi i \mathbf{k}\cdot \mathbf{r}_j)
+$$
+\end{document}
+
diff --git a/doc/Eqs/compute_xrd3.jpg b/doc/Eqs/compute_xrd3.jpg
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diff --git a/doc/Eqs/compute_xrd3.tex b/doc/Eqs/compute_xrd3.tex
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index 0000000000..da0254134c
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+++ b/doc/Eqs/compute_xrd3.tex
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+\documentstyle[12pt]{article}
+
+\begin{document}
+
+$$ 
+  Lp(\theta)=\frac{1+cos^{2}(2\theta)}{cos(\theta)sin^{2}(\theta)}
+$$
+\end{document}
+
diff --git a/doc/Eqs/compute_xrd4.jpg b/doc/Eqs/compute_xrd4.jpg
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diff --git a/doc/Eqs/compute_xrd4.tex b/doc/Eqs/compute_xrd4.tex
new file mode 100644
index 0000000000..d4deb7ca55
--- /dev/null
+++ b/doc/Eqs/compute_xrd4.tex
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+\documentstyle[12pt]{article}
+
+\begin{document}
+
+$$ 
+  \frac{sin(\theta)}{\lambda}=\frac{\left | \mathbf{k} \right |}{2}
+$$
+\end{document}
+
diff --git a/doc/Eqs/compute_xrd5.jpg b/doc/Eqs/compute_xrd5.jpg
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diff --git a/doc/Eqs/compute_xrd5.tex b/doc/Eqs/compute_xrd5.tex
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index 0000000000..2d97a3288b
--- /dev/null
+++ b/doc/Eqs/compute_xrd5.tex
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+\documentstyle[12pt]{article}
+
+\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}
+