Test

We test tex:

[math]\displaystyle{ F_{hkl} = \sum_{i=1}^{N} e^{-2\pi\imath\left( h\frac{x}{a}+k\frac{y}{b}+l\frac{z}{c}\right)} }[/math]

test

All crystals should look like this (or better) File:Xtals.png