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Components of the atomizing units across brands and generations of ECs. Tables show the presence or absence of an atomizing unit component in each EC. (A) Major components (filament, thick wire, wire-wire joint, wire-wire-tube joint, air-tube, wick, sheath, fibers) present in ECs. (B) Methods of joining components (wire–wire joint, wire–air-tube joint) and presence or absence of fiber types. Boxes in color = component is present, white boxes = the component is absent.
