REPRINT OF: Aberration measurement in HRTEM: Implementation and diagnostic use of numerical procedures for the highly precise recognition of diffractogram patterns

► Algorithms for the highly precise diffractogram analysis in HRTEM are introduced. ► AMADEUS procedure measures defocus and astigmatism with a few Angstrom precision. ► Aberration measurement meets the precision requirements of 0.5 Å microscopy. ► Quantitative criteria for the optical stability of HRTEMs are introduced.