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Appearance of phase-plate central hole when adjusting the final condenser lens for the “on-plane” condition. (A) Condenser lens too weak, (B) proper setting of condenser lens, (C) condenser lens too strong. With our LaB6 TEM, we find that the setting in (C) gives better contrast for centering the phase plate. With an FEG TEM, many fringes can be seen inside the off-plane phase-plate central hole.
