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The terms <math>\Delta I_\text{obj}/I_\text{obj}</math> and <math>\Delta V_\text{acc}/V_\text{acc}</math> represent instabilities in of the total current in the magnetic lenses and the acceleration voltage. <math>\Delta E/V_\text{acc}</math> is the energy spread of electrons emitted by the source.
The information limit of current state-of-the-art TEMs is well below 1 Å. The '''[[Transmission Electron Aberration-corrected Microscope|TEAM]]''' project at Lawrence Berkeley National Laboratory resultet in the first TEM to reach an information limit of <0.5 Å in 2009 <ref>{{cite web |title=TEAM project web page |url=http://ncem.lbl.gov/team/TEAMpage/TEAMpage.html |deadurl=no |accessdate=8 August 2013}}</ref> by the use of a highly stable mechanical and electrical environment, an ultra-bright, monochromated electron source and double-[[Sextupole magnet|hexapole]] aberration correctors.
===Optimum defocus in HRTEM===
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