Focus Astigmatism Practice

This routine allows you to interactively (if slowly) change the defocus and astigmatism settings of a high resolution electron microscope image, using the strong phase object approximation.  You start with random focus and astimatism settings if "Gaussian center" is unchecked.  If you can find Scherzer defocus without "power spectrum" checked, you are doing pretty good!  Scherzer defocus is the image that you get if you check Gaussian center on startup.  Defocus and astimatism settings are in Angstroms.

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