This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
 

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Figure 2397 compares the two commercial fixed-beam energy filters (a typical Zeiss Ω filter and a typical Gatan filter) for energy selected imaging (ESI) in TEM columns. Both can be used in EFTEM imaging.

Figure 2397. Schematic comparison between a typical Zeiss Ω filter (a) and a typical Gatan filter (b) for energy selected imaging (ESI) in TEM columns.