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---
description: How to define frequency meshes (on the imaginary and real axes) for MBPT calculations
authors: MG
---
<!--- This is the source file for this topics. Can be edited. -->
This page gives hints on how to define frequency meshes (on the imaginary and real axes)
for MBPT calculations with the ABINIT package.
## Introduction
In the contour deformation technique, and other cases, one has to define a set
of frequencies on which different numerical operations will be performed
(computation of susceptibility matrices, integration along the real+imaginary
axes). In the present topic, the input variables connected to such definitions
are gathered.
## Related Input Variables
{{ related_variables }}
## Selected Input Files
{{ selected_input_files }}
## Tutorials
* [[tutorial:gw2|The second tutorial on GW]] deals with the computation of the quasi-particle band structure of Aluminum, in the GW approximation (so, much better than the Kohn-Sham LDA band structure) without using the plasmon-pole model.
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