How to calculate the Fermi surface nesting function

In summary, the Fermi surface nesting function is a mathematical function used to analyze the electronic band structure and physical properties of materials. It is calculated by taking the Fourier transform of the electron density in reciprocal lattice space and provides information about the nesting vector and strength of nesting. This function plays a crucial role in determining electronic and magnetic properties, but has limitations such as assuming a perfectly periodic lattice and not considering electron-electron interactions.
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cdm
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TL;DR Summary
I have seen some papers about fermi surface nesting function. I know the specific form of the function.However, I don't know how to write the code to plot the image based on my result of Quantum Espresso package.
1)E22$%6AZ)JLBWW~L%0)[E.png
 

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