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The contrast transfer function determines how much phase signal gets transmitted to the real space wavefunction in the image plane. As the [[modulus squared]] of the real space wavefunction gives the image signal, the contrast transfer function limits how much information can ultimately be translated into an image. The form of the contrast transfer function determines the quality of real space image formation in the TEM.
[[File:Unmodified CTF.pdf|thumb|CTF Function prepared via web applet created by Jiang and Chiu, available at
This is an example contrast transfer function. There are a number of things to note:
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