\[\exp\left(-2\pi i\left(\frac{z-z_{n}}{\Delta z}+\frac{2x}{\Delta x}\right)%
\right)\*{\left(2\exp\left(\frac{-6\pi ix}{\Delta x}\right)\cos\left(\frac{2%
\sqrt{3}\pi y}{\Delta x}\right)+1\right)}=\sqrt{3}.\]