No, it isn’t some kinky fun with rubber :-p
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![Input: F(hkl) = \sum _{j} f _j (\theta) \cdot \exp[-8\pi^2U_j\sin^2 \frac {\theta} {\lambda^2}] \cdot \exp [2 \pi i (hx_j + ky_j + i z_j]](http://blog.tolien.co.uk/wp-content/uploads/0fab5bebc0ac89894380099094fe596d.png)