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<p style="margin-top:0;margin-bottom:0">Dear all.</p>
<p style="margin-top:0;margin-bottom:0">I'm trying to find out how the contribution of a hole free or Volta phase plate to the PCTF is described mathematically in various packages that are used for cryo-EM of macromolecules.</p>
<p style="margin-top:0;margin-bottom:0">The physics behind it would also be of interest.</p>
<p style="margin-top:0;margin-bottom:0">Does anybody know a reference or have some material that can be shared?</p>
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